期刊文献+
共找到179篇文章
< 1 2 9 >
每页显示 20 50 100
Spatiotemporal Variations and Regional Transport of Air Pollutants in Two Urban Agglomerations in Northeast China Plain 被引量:10
1
作者 LI Xiaolan HU Xiaoming +3 位作者 SHI Shuaiyi SHEN Lidu LUAN Lan MA Yanjun 《Chinese Geographical Science》 SCIE CSCD 2019年第6期917-933,共17页
Characteristics of air pollution in Northeast China(NEC) received less research attention in the past comparing to other heavily polluted regions in China.Spatiotemporal variations of six criteria air pollutants(PM10,... Characteristics of air pollution in Northeast China(NEC) received less research attention in the past comparing to other heavily polluted regions in China.Spatiotemporal variations of six criteria air pollutants(PM10, PM2.5, SO2, NO2, O3 and CO) in Central Liaoning Urban Agglomeration(CLUA) and Harbin-Changchun Urban Agglomeration(HCUA) in NEC Plain were analyzed in this study based on three-year hourly observations of air pollutants and meteorological variables from 2015 to 2017.The results indicated that the annual mean concentrations of air pollutants are generally higher in the middle and southern regions in NEC Plain and lower in the northern region.Megacities such as Shenyang, Harbin and Changchun experience severe air pollution, with a three-year averaged air quality index(AQI) larger than 80, far exceeding the daily AQI standard at the first-level of 50 in China.The annual mean PM and SO2 concentrations decrease most significantly in NEC urban agglomerations from 2015 to 2017, followed by CO and NO2, while O3 shows a slight increasing trend.All the six pollutants exhibit obvious seasonal and diurnal variations, and these variations are dictated by local emission and meteorological conditions.PM2.5 and O3 concentrations in NEC urban agglomerations strongly depend on wind conditions.High O3 concentrations at different cities usually occur in presence of strong winds but are independent on wind direction(WD), while high PM2.5 is usually accompanied by weak winds and poor dispersion condition, and sometimes also occur when the northerly or southerly winds are strong.Regional transport of air pollutants between NEC urban agglomerations is common.A severe haze event on November 1–4, 2017 is examined to demonstrate the role of regional transport on pollution. 展开更多
关键词 criteria air POLLUTANT METEOROLOGICAL condition regional transport urban AGGLOMERATION of NORtheAST China
下载PDF
Impact of the Transboundary Transport of Air Pollutants on Air Quality in Spain
2
作者 Marta G. Vivanco Inmaculada Palomino +3 位作者 Juan Luis Garrido Ma ángeles González Gonzalo Alonso Fernando Martín 《Journal of Environmental Protection》 2012年第9期1167-1175,共9页
Although compliance with the European limit values for air pollutants has been achieved over large parts in Spain, some challenges remain for O3 on the maximum daily 8-hour mean and information limit values, for parti... Although compliance with the European limit values for air pollutants has been achieved over large parts in Spain, some challenges remain for O3 on the maximum daily 8-hour mean and information limit values, for particulate matter on the PM10 annual and daily limit values and for NO2 on annual and hourly limit values. Transboundary transport of air pollutants has started to be recognized as a mechanism affecting air quality. Nevertheless, as a consequence of the complexity of atmospheric chemistry it is not easy to determine the importance of this effect. Photochemical models constitute an adequate tool to address this challenge, allowing the identification of pollutant pathways and the quantifi- cation of the influence of long-range transport of air pollutants. In this paper we evaluate the influence of out-of-Spain emissions on this non-compliance picture by using the CHIMERE photochemical model. For this purpose the model was run at a 0.2?-horizontal resolution for a European domain. Although at this resolution not all the local effects can be captured, transboundary transport of air pollutants can be examined. Several simulations were performed considering different emission scenarios. To see all out-of-Spain emissions influence, all the emissions were set to zero, excepting those in Spain. This includes examining European and ships effects on air quality in Spain. A second simulation was performed setting to zero just European-countries emissions, to see the effect of Europe. The third and fourth simulations were carried out by setting to zero France and Portugal emissions respectively. Ozone has been found to be the pollutant more affected by this transboundary transport, in particular in the summer period. The model indicates that the incoming air masses contributed in 2009 to the non-compliance with the European normative regulating the maximum daily 8-hour mean. 展开更多
关键词 TRANSBOUNDARY transport air POLLUTION
下载PDF
Numerical Modeling of Air Pollutants Emitted by Waterway Transportation
3
作者 Marilia Mitidieri Fernandes de Oliveira Nelson Francisco Favilla Ebecken +1 位作者 Jorge Luiz Fernandes de Oliveira Marina Aires 《Journal of Geoscience and Environment Protection》 2016年第6期123-136,共14页
The world maritime transportation is suffering a large increase in recent years and as a result of this increased on global trade, there is a consequent increase in waterway transportation and demand for fossil fuels,... The world maritime transportation is suffering a large increase in recent years and as a result of this increased on global trade, there is a consequent increase in waterway transportation and demand for fossil fuels, resulting in emissions of air pollutants. Consequently, the impact of transport emissions on climate change was put on the list of priorities. It has a high fuel demand as a result of continuous use of main engines for propulsion, electricity and heat production. The highest exposure levels of air pollution are found in ports and near them because most of the world fleet is positioned in these areas. The port of Rio de Janeiro city, in the Southeast Brazilian coastal, is inserted in the Guanabara Bay (GB), where the breezes recirculate pollutants in Metropolitan Region of Rio de Janeiro (MRRJ). Therefore, the aim of this research was to use the Brazilian Regional Atmospheric Modeling System (BRAMS) to generate the wind fields in the MRRJ and to calculate the trajectories of pollutants emitted on GB related to the waterway transportation, using a 3D kinematic trajectories model. Results demonstrated that for the periods analysed, the Central and west areas in the coastal region of the Rio de Janeiro city were the local most affected in the summer. In winter the trajectories reached the cities of the Rio de Janeiro and Duque de Caxias. Both in summer and winter, the trajectories followed towards the South Atlantic Ocean in the morning. Conclusions about this study show the need of decision-making process for better management of waterway transportation sector, improving the harmful effects on air quality in cities located in coastal regions. 展开更多
关键词 Maritime transport Ship Emissions air Pollution Meteorological Models Guanabara Bay
下载PDF
Molecular mechanisms and cellular process in signal transduction pathway related to air pollutants in obstructive lung diseases:A mini-review
4
作者 AN-SOO JANG 《BIOCELL》 SCIE 2023年第8期1703-1708,共6页
Exposure to air pollutants such as PM_(10),PM_(2.5),PM_(0.1),O_(3),CO,NO2,and SO_(2),and biological pollutants are important factors causing the evolution and furtherance of obstructive lung diseases(OLD),including as... Exposure to air pollutants such as PM_(10),PM_(2.5),PM_(0.1),O_(3),CO,NO2,and SO_(2),and biological pollutants are important factors causing the evolution and furtherance of obstructive lung diseases(OLD),including asthma and chronic obstructive pulmonary disease(COPD).Asthma is the most frequent chronic inflammatory airway disease,characterized by breathlessness,wheezing,chest tightness,and cough,together with the presence of exaggerated expiratory airflow fluctuation that varies over time.COPD is a heterogeneous lung condition characterized by chronic respiratory symptoms such as dyspnea,cough,expectoration,and/or exacerbations due to abnormalities of the airways and/or alveoli that cause persistent,often progressive,airflow obstruction.Understanding the molecular mechanisms and cellular processes based on the development of OLD on exposure to air pollutants will provide insights into the solution of pathogenesis,prevention,and treatment of these conditions.The molecular mechanisms and cellular process involved in signal transduction pathway plays a role in the binding of extracellular signaling molecules and ligands to receptors placed on the cell surface or on the inner side cell that trigger inflammation that occurs,especially when something important enters the cell to bring into a cascade response.This binding then alters the cell metabolism,shape,and gene expression in the airway.This review aimed to reveal the effect of air pollutants on the molecular mechanisms and cellular processes involved in the signal transduction pathways in OLD. 展开更多
关键词 air pollutants Obstructive lung diseases Signal pathway
下载PDF
Assessment of Impacts and Risks of Air Pollution Applying Two Strategies of Numerical Chemistry Transport Modelling
5
作者 Adolf Ebel Dimitris Melas +11 位作者 Kostadin Ganev Manjola Banja Ion Sandu Elmar Friese Theodoros Giannaros Hermann J. Jakobs Ioannis Kioutsioukis Konstantinos Markakis Michael Memmesheimer Nikolai Miloshev Victor Pescaru Anastasia Poupkou 《Journal of Environmental Protection》 2012年第1期26-40,共15页
Assessment of harmful impacts and risks of air pollution in case of accidents as well as of long lasting exposition is an important challenge of chemical transport modeling. Sad confirmation of this statement unexpect... Assessment of harmful impacts and risks of air pollution in case of accidents as well as of long lasting exposition is an important challenge of chemical transport modeling. Sad confirmation of this statement unexpectedly has come from the nuclear power plant accident in Fukushima which occurred while this paper was finalized. Two strategies to comply with the task of impact and risk assessment in extended regions like Central Europe or the Balkans are described. The first one is characterized by application of a single model system to an extended domain. The other one is based on the combined application of several chemical transport models designed for the use in various sub-domains in the region under consideration. Advantages and disadvantages exist for both approaches. For instance, the single model strategy allows unified and harmonized assessment of risks in a larger region, whereas the combined model strategy may pro-vide faster and locally more specific response in emergency cases. The single model approach is treated exploiting applications of the EURAD model system. The combined model approach is a novel way of joint use of chemical transport model systems developed for the Balkans. The models are described and the accuracy of simulations carried out with them is briefly demonstrated by comparison of simulated and observed concentrations of air pollutants. Applications regarding the search of sources for high pollution events and the assessment of risks through known sources are exem-plarily discussed. 展开更多
关键词 air Pollution Chemical transport Modeling Risk ACCIDENTAL Release EMERGENCY BALKAN MODEL SYSTEM EURAD MODEL SYSTEM
下载PDF
Dynamic Modeling of Air Pollution and Acid Rain from Energy System and Transport in Kosovo
6
作者 Skender Kabashi Sadik Bekteshi +5 位作者 Skender Ahmetaj Gazmend Kabashi Kushtrim Podrimqaku Valon Veliu Albert Jonuzaj Aleksander Zidansek 《Open Journal of Air Pollution》 2012年第3期82-96,共15页
Sulfur dioxide (SO2) and nitrogen dioxide (NO2) emissions generated at coal burning power plants and from transport are a leading cause of acid deposition and chemical smog in many parts of the world. Sulfur dioxide e... Sulfur dioxide (SO2) and nitrogen dioxide (NO2) emissions generated at coal burning power plants and from transport are a leading cause of acid deposition and chemical smog in many parts of the world. Sulfur dioxide emitted by thermal power plants and from transport in Kosovo is transported via prevailing winds to other locations. Through its journey, this SO2 gas undergoes a series of chemical reactions that ultimately transform it into sulfuric acid (H2SO4) which is deposited as acid rain. As a consequence of NO2 emissions from electricity production and transport in Kosovo the ozone (O3) is formed as photochemical smog due to sunlight, which triggers the breakdown of NO2. We modeled the impact of SO2 and NO2 emissions from energy system and transport in Kosovo on acid deposition and chemical smog locally. In model we consider the role of SO2 and NO2 pollution control technologies on mitigating these impacts. 展开更多
关键词 Modeling air Pollution transport Acid Rain Chemical Smog KOSOVO
下载PDF
A review of the technology and applications of methods for evaluating the transport of air pollutants 被引量:1
7
作者 Xiaoqi Wang Shuiyuan Cheng +5 位作者 Ying Zhou Hanyu Zhang Panbo Guan Zhida Zhang Weichao Bai Wujun Dai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2023年第1期341-349,共9页
A variety of methods based on air quality models,including tracer methods,the bruteforce method(BFM),decoupled direct method(DDM),high-order decoupled direct method(HDDM),response surface models(RSMs)and so on forth,h... A variety of methods based on air quality models,including tracer methods,the bruteforce method(BFM),decoupled direct method(DDM),high-order decoupled direct method(HDDM),response surface models(RSMs)and so on forth,have been widely used to study the transport of air pollutants.These methods have good applicability for the transport of air pollutants with simple formation mechanisms.However,differences in research conclusions on secondary pollutants with obvious nonlinear characteristics have been reported.For example,the tracer method is suitable for the study of simpli?ed scenarios,while HDDM and RSMs are more suitable for the study for nonlinear pollutants.Multiple observation techniques,including conventional air pollutant observation,lidar observation,air sounding balloons,vehicle-mounted and ship-borne technology,aerial surveys,and remote sensing observations,have been utilized to investigate air pollutant transport characteristics with time resolution as high as 1 sec.In addition,based on a multi-regional input-output model combined with emission inventories,the transfer of air pollutant emissions can be evaluated and applied to study the air pollutant transport characteristics.Observational technologies have advantages in temporal resolution and accuracy,while modeling technologies are more?exible in spatial resolution and research plan setting.In order to accurately quantify the transport characteristics of pollutants,it is necessary to develop a research method for interactive veri?cation of observation and simulation.Quantitative evaluation of the transport of air pollutants from different angles can provide a scienti?c basis for regional joint prevention and control. 展开更多
关键词 air pollutant transport Simulation technology Observation technology transport matrix transport?ux
原文传递
Recent Enhanced Deep Troposphere-to-Stratosphere Air Mass Transport Accompanying the Weakening Asian Monsoon
8
作者 Bin CHEN Jianzhong MA +3 位作者 Wei ZHANG Jianchun BIAN Tianliang ZHAO Xiangde XU 《Journal of Meteorological Research》 SCIE CSCD 2024年第4期708-719,共12页
The Asian monsoon(AM) region is a well-known region with prevailing stratosphere–troposphere exchange(STE).However,how the STE across this region changes with the weakening AM remains unclear.Here,we particularly dia... The Asian monsoon(AM) region is a well-known region with prevailing stratosphere–troposphere exchange(STE).However,how the STE across this region changes with the weakening AM remains unclear.Here,we particularly diagnose the air mass transport between the planetary boundary layer(PBL) and the stratosphere over the AM region during 1992–2017 using the Lagrangian particle dispersion model FLEXPART based on the ERA-Interim reanalysis data.The results show that both the downward and upward deep STEs exhibit a detectable increasing trend,while the latter,namely,the deep troposphere-to-stratosphere transport(DTST),is relatively more significant.Further analysis reveals that the long-term trend of DTST over the AM region could be partly attributed to changes in the Pacific Walker circulation and the air temperature(especially at upper levels).Additionally,it is found that DTST increases markedly over the tropical oceanic regions,while the increasing DTST into the stratosphere can be attributed to the enhanced air masses originated from the PBL over the terrestrial regions,where large amounts of pollutant emissions occur.The results imply that the influence of the DTST on the chemical composition and the climate of the stratosphere over the AM region is expected to become increasingly important,and is thereby of relevance to climate projection in an evolving climate. 展开更多
关键词 stratosphere–troposphere exchange(STE) air mass transport deep troposphere-to-stratosphere transport(DTST) Asian monsoon(AM) POLLUTION
原文传递
Influence of transboundary air pollution on air quality in southwestern China 被引量:5
9
作者 Xiufeng Yin Shichang Kang +6 位作者 Maheswar Rupakheti Benjamin de Foy Ping Li Junhua Yang Kunpeng Wu Qianggong Zhang Dipesh Rupakheti 《Geoscience Frontiers》 SCIE CAS CSCD 2021年第6期114-128,共15页
Air pollution is a grand challenge of our time due to its multitude of adverse impacts on environment and society,with the scale of impacts more severe in developing countries,including China.Thus,China has initiated ... Air pollution is a grand challenge of our time due to its multitude of adverse impacts on environment and society,with the scale of impacts more severe in developing countries,including China.Thus,China has initiated and implemented strict air pollution control measures over last several years to reduce impacts of air pollution.Monitoring data from Jan 2015 to Dec 2019 on six criteria air pollutants(SO_(2),NO_(2),CO,O_(3),PM_(2.5),and PM_(10))at eight sites in southwestern China were investigated to understand the situation and analyze the impacts of transboundary air pollutants in this region.In terms of seasonal variation,the maximum concentrations of air pollutants at these sites were observed in winter or spring season depending on individual site.For diurnal variation,surface ozone peaked in the afternoon while the other pollutants had a bimodal pattern with peaks in the morning and late afternoon.There was limited transport of domestic emissions of air pollutants in China to these sites.Local emissions enhanced the concentrations of air pollutants during some pollution events.Mostly,the transboundary transport of air pollution from South Asia and Southeast Asia was associated with high concentrations of most air pollutants observed in southwestern China.Since air pollutants can be transported to southwestern China over long distances from the source regions,it is necessary to conduct more research to properly attribute and quantify transboundary transport of air pollutants,which will provide more solid scientific guidance for air pollution management in southwestern China. 展开更多
关键词 air pollutants Transboundary transport Southwestern China
下载PDF
Using KELEA (Kinetic Energy Limiting Electrostatic Attraction) to Improve the Efficiency of Fuel Combustion 被引量:1
10
作者 W. John Martin 《Open Journal of Air Pollution》 2017年第3期103-116,共14页
There are many reports of devices and fuel additives being able to enhance the performance of automobiles and other forms of transportation that rely upon the combustion of gasoline or diesel fuels. The claims extend ... There are many reports of devices and fuel additives being able to enhance the performance of automobiles and other forms of transportation that rely upon the combustion of gasoline or diesel fuels. The claims extend from increased mileage and power to significant reductions in toxic exhaust emissions of carbon monoxide and unburnt hydrocarbons. Progress towards more widespread applications of means of improving fuel efficiency has been impeded by the lack of a coherent explanation of the mechanism of action. Fuel combustion allows for the conversion of much of the available chemical energy in volatile hydrocarbons to mechanical energy, which moves the pistons within an engine. It is proposed that the amount of chemical energy in hydrocarbons can be increased by the absorption of an environmental force termed KELEA (kinetic energy limiting electrostatic attraction). In addition to providing greater mechanical energy with relatively less heat output, the combustion of KELEA activated fuels proceeds further with less toxic emissions of carbon monoxide and unburnt hydrocarbons from incomplete combustion. KELEA activation of fuels should become standard practice in the transportation industry, with potential additional benefits in slowing the rate of global warming. 展开更多
关键词 KELEA Chemistry transportation Hydrocarbons Combustion Fuel EFFICIENCY air Pollution Exhaust Carbon MONOXIDE Gasoline Diesel Global WARMING PHOTOSYNtheSIS Hydrogen Electrical CHARGES
下载PDF
Assessment of the Contribution of Road Traffic to Greenhouse Emissions: A Case of an Algerian City
11
作者 Aouragh Leila Bourmada Noureddine 《Journal of Environmental Protection》 2014年第13期1364-1372,共9页
Rapid urbanisation brings about increase in air pollution. These emissions are generally linked to the production of energy, to industrial activities and to transport in the densely inhabited areas. Estimating the pol... Rapid urbanisation brings about increase in air pollution. These emissions are generally linked to the production of energy, to industrial activities and to transport in the densely inhabited areas. Estimating the pollutants quantities released in the air is an important stage in the evaluation of air quality. However, the problem of air pollution in urban areas is a problem in all Algerian cities. Similar to all Algerian big cities, the city of Batna has become a major urban area with an ever increasing fleet of motor vehicles most of which are practically old ones. This state of affairs increases the demand in fuel consumption and undeniably intensifies polluting emissions. As the situation goes, it has become the utmost urgency to wonder about a possible support that may be given to this sector in order to evaluate how air quality is managed in a durable way. The main objective of this study is to assess the quantity of CO2 pollutant known as the most significant greenhouse gas emission from traffic. The approach used is mainly based on a number of assumptions, which allows us to find the amount of 192 g/km/day CO2 released into the urban atmosphere of the city of Batna. 展开更多
关键词 air POLLUTION ROAD transport GREENHOUSE Gas Emission FACTORS Impact
下载PDF
Sources and Trends of Persistent Organic Pollutants at Three Passive Monitoring Sites in South Africa
12
作者 Lloyd Shorai Pisa Nelson Mhlanga Patricia Mumbengengwi 《Journal of Geoscience and Environment Protection》 2020年第7期207-218,共12页
The Stockholm Convention on Persistent Organic Pollutants (SCPOPs) is an international treaty that operates under the patronage of the United Nations (UN) to control certain chemicals that are considered persistent or... The Stockholm Convention on Persistent Organic Pollutants (SCPOPs) is an international treaty that operates under the patronage of the United Nations (UN) to control certain chemicals that are considered persistent organic pollutants (POPs). They are of great concern because of their adverse effects on human health and the environment. Exposure to POPs may lead to cancer, infertility, respiratory infections, and other health complications. It is therefore critical to study the degree of human and environmental exposure to these POPs. Passive air sampling was conducted in South Africa to evaluate the presence and trends of persistent organic pollutants at Barberspan (rural agricultural), Vanderbijl Park (urban industrial) and Molopo Nature Reserve (isolated nature reserve). Samples were collected in 2012. Passive air samplers using poly were used for sampling. The Buchi System B-811 automatic extractor was used to analyze for dichloro-diphenyl-trichlorethane (DDT), pentachlorobenzene (PeCB), hexechlorobenzene (HCB) polychlorinated biphenyls (PCBs) and hexachlorocyclohexane (HCH). Sampling was conducted for a period of one year. POPs concentrations were generally low at all sites, but Vanderbijl Park had the highest concentrations. Seasonal changes in concentrations were much the same at the three sites with temperatures and wind patterns being major factors. The presence of these chemicals in Molopo Nature Reserve and Barberspan is evidence of long range transportation over dry semi desert areas. Back-trajectories indicate possible sources, including areas where DDT is used for malaria control. The presence of POPs is areas they have never been in use poses health and environmental risks in these areas. 展开更多
关键词 Persistent Organic pollutants Passive air Sampling Long Range transportation
下载PDF
Preliminary Results of Application Mobilev Traffic model to Calculate Air Emission and Assessing Policies for Reducing Air Emissions in an ASEAN City
13
作者 Ho Quoc Bang Vu Hoang Ngoc Khue 《现代交通(中英文版)》 2016年第1期1-10,共10页
Traffic is one of the main air pollution source in urban cities,especially in Ho Chi Minh City.Annually,it emits a huge amount of pollutants into the atmosphere;and air quality in HCMC becomes worse due to circulation... Traffic is one of the main air pollution source in urban cities,especially in Ho Chi Minh City.Annually,it emits a huge amount of pollutants into the atmosphere;and air quality in HCMC becomes worse due to circulation of outdate private vehicles.Therefore,clean air plan(CAP)is necessary for reducing air pollution level in the city and air emission inventory(EI)is an essential step to develop CAP.Mobilev model from Germany was chosen to conduct EI for HCMC.Objectives include of this study:(i)elaborating an air emission inventory(EI)from road traffic activities over HCMC;and(ii)assessing emission control policies and study abatement strategies to reduce air pollution level from traffic activities for HCMC in 2020.The results indicated that motorcycles are the main sources of air emission in HCMC.The emissions of CO are 3,586.707 tons/year,following ish VOC,NOx,CH4,NO2,SO2 and particulate matter(PM).In addition,CO2,which is one of the main greenhouse gases,also included and contributed 36,293.501 ton/year.These pollutants concentrated in the center which has crowded roads and population,affecting directly human health.Therefore,a replaced private vehicle with public transportation is necessary to reduce emissions.Two abatement strategies to 2020 for reducing emissions were performed and showed that if the HCMC government has severe policies on motor vehicles,the emission will be reduced until 60%,opposite emissions in 2020 will be increased to 200%. 展开更多
关键词 Emission INVENTORY Mobilev Model Ho CHI Minh transportation air POLLUTION ASEAN CITIES
下载PDF
Impact of Noise Barriers on Air-Pollution Dispersion
14
作者 Josef Brechler Vladimir Fuka 《Natural Science》 2014年第6期377-386,共10页
The impact of noise barriers on gaseous air-pollution dispersion was examined using the high-resolution CLMM (Charles University LES (Large Eddy Simulation) Microscale Model). The dispersion of a mixture of nitrogen o... The impact of noise barriers on gaseous air-pollution dispersion was examined using the high-resolution CLMM (Charles University LES (Large Eddy Simulation) Microscale Model). The dispersion of a mixture of nitrogen oxides (denoted as NOx—a mix of NO and NO2) was computed, providing the simulation in which wind direction is approximately perpendicular to the noise barriers. The barriers were assumed to be straight and infinitely long, with a height of 3 m. Dispersion of NOx was modeled for situations with no noise barriers along the highway, barriers on both sides, and for a single barrier on the upwind and downwind sides of the highway. The modelling results are presented and discussed in relation to previous studies and the implications of the results are considered for pollution barriers along highways. 展开更多
关键词 LES MODELLING Noise Barriers TRAFFIC air-POLLUTION air-POLLUTION transport and DISPERSION
下载PDF
Promoting Pedestrian Transportation for Reducing Air Pollution from Urban Transport
15
作者 Emre Kuşkapan Muhammed YasinÇodur 《Journal of Environmental & Earth Sciences》 2022年第1期47-53,共7页
Increasing air pollution around the world causes many problems,especially in the field of health.Air pollution affects not only human health but also other living things health.The factors that cause air pollution the... Increasing air pollution around the world causes many problems,especially in the field of health.Air pollution affects not only human health but also other living things health.The factors that cause air pollution the most are heating,industry,and transportation.Many countries in the world carry out various studies to reduce the effect of these factors on air pollution.Especially in the field of transportation,studies have been quite a lot in recent years.In this study,air pollution caused by transportation in Erzurum,Turkey has investigated.Emission amounts of NO_(X),PM_(10),and SO_(2) values have calculated according to the types of vehicles in the city.Then,the amount of emissions from transportation in the total sector has revealed.The transportation structure of the city has examined in general terms and the missing aspects in terms of pedestrian transportation have revealed.Finally,some solution proposals aiming to encourage the use of pedestrian transportation and micro mobility vehicles in order to reduce motor land vehicles are presented. 展开更多
关键词 air pollution Urban transport PEDESTRIANS
下载PDF
城市交通碳排放优化模型构建及其对大气污染的治理作用研究
16
作者 鹿巍 朱文秀 司海峰 《环境科学与管理》 CAS 2024年第10期41-44,50,共5页
构建了城市交通碳排放优化模型,测试优化效果以及对大气污染的治理作用。以X市为例,选取相关交通参数,求解最优城市交通出行结构的碳排放优化模型,为模型制定一系列约束条件,以实现最优的碳排放优化效果。通过linprog函数的调用求解了模... 构建了城市交通碳排放优化模型,测试优化效果以及对大气污染的治理作用。以X市为例,选取相关交通参数,求解最优城市交通出行结构的碳排放优化模型,为模型制定一系列约束条件,以实现最优的碳排放优化效果。通过linprog函数的调用求解了模型,获取数据后计算优化效果。优化后公共交通方式占据主导地位,交通结构得到改善。月平均拥堵时长大幅下降,各区域均得到降低。二氧化碳等污染物日平均浓度也得到降低,其中二氧化碳降低了200 mg/m^(3)以上。该模型具有显著的碳排放优化效果以及对大气污染的治理作用。 展开更多
关键词 交通碳排放 约束条件 大气污染 治理作用
下载PDF
定州市冬季典型重污染过程及成因分析
17
作者 李晓宇 张英磊 范光宇 《绿色科技》 2024年第4期185-192,213,共9页
以河北省定州市2019年12月6-17日的重污染天气过程为例,运用特征雷达图、HYSPLIT-4后向轨迹模型、数值模拟与观测资料统计相结合的方法,对此次重污染天气过程的天气形势、污染特征、污染成因、输送路径和潜在源区进行了分析。结果表明:... 以河北省定州市2019年12月6-17日的重污染天气过程为例,运用特征雷达图、HYSPLIT-4后向轨迹模型、数值模拟与观测资料统计相结合的方法,对此次重污染天气过程的天气形势、污染特征、污染成因、输送路径和潜在源区进行了分析。结果表明:(1)本次污染过程,静稳、高湿、逆温及边界层较低的不利气象条件是外因,本地积累、区域传输导致污染加重。随着湿度的增大,PM_(2.5)/PM_(10)向50%~100%区间聚集,说明湿度增大对颗粒物的二次转化速率加快有显著影响;定州市污染特征表现为偏综合型、偏二次型和偏燃煤型占比较大(分别为31%、28%、16%),污染高值时段主要受偏二次型影响,气态污染物在不利气象条件下向颗粒物转化和颗粒物的吸湿增长显著抬升了PM_(2.5)浓度,部分时段受偏燃煤型影响。此次重污染过程主要受本地污染源(占比30%~58%)排放影响,其次受到周边城市的污染传输影响,保定市污染传输占比为17%~34%、石家庄市污染传输占比为8%~27%;距离较远的城市如山东、山西、河南的污染传输影响较小,本地排放源中,乡镇污染突出。(2)定州市2019年12月6-17日启动重污染应急橙色预警,启动应急措施后PM_(2.5)浓度削减约10μg/m^(3),削减比例为11.4%,增加了1个良天,因欠缺区域间减排合作,减排效果不显著。定州市除了本地及河北省的贡献以外,还有约10%来自山东、河南和山西的污染传输。因此如预警措施只针对整个河北省虽有一定的减排效果,但仍不能达到理想效果。为避免大气扩散条件较差情况下产生的重污染过程,区域之间的合作尤其重要。 展开更多
关键词 重污染天气 污染特征 污染成因 输送路径和潜在源区
下载PDF
浅析大气污染治理的建议与措施
18
作者 曲晓文 马晓龙 +1 位作者 岳东 庄亚芹 《皮革制作与环保科技》 2024年第13期119-121,共3页
本文深入探讨了大气污染的现状及其成因,并在此基础上提出了一系列针对性的治理建议与措施。大气污染问题日益严重,主要源于工业排放、交通运输、能源消耗等多个方面。为应对这一挑战,本文建议加强法律法规建设,建立跨部门协作机制,推... 本文深入探讨了大气污染的现状及其成因,并在此基础上提出了一系列针对性的治理建议与措施。大气污染问题日益严重,主要源于工业排放、交通运输、能源消耗等多个方面。为应对这一挑战,本文建议加强法律法规建设,建立跨部门协作机制,推广清洁能源,提高工业污染治理水平以及发展智能交通系统。这些措施的实施将有助于改善大气环境质量,保障公众健康,促进可持续发展。 展开更多
关键词 大气污染 治理措施 法律法规 智能交通系统
下载PDF
Sustainable urbanization: energy and environment in the Chongqing Municipality, China 被引量:3
19
作者 李百战 Koen Steermers 《Journal of Chongqing University》 CAS 2005年第4期199-207,共9页
Chongqing is the largest municipality under the Chinese Central Government (MCG) in terms of administrative area and population and is now the most important economic and cultural center of the upper Yangtze River and... Chongqing is the largest municipality under the Chinese Central Government (MCG) in terms of administrative area and population and is now the most important economic and cultural center of the upper Yangtze River and Three Gorges area. The Three Gorges Dam project, one of the largest world infrastructure projects, causes a great deal of immigration to Chongqing and results in the rapid urbanization of the city, and it has brought in a great deal of environmental impact, which is a global concerned issue. This paper introduces the city profile of Chongqing municipality and its urbanization impact on energy and environment. The demand and the trend of energy consumption in built environment (building and transport) have been analysed. The living environment of Chongqing residents and the local energy efficient policy have been introduced. Finally the authors discuss the key issues of the sustainable urban development of Chongqing. 展开更多
关键词 energy and environment CHONGQING URBANIZATION BUILDING transport air pollution .
下载PDF
Impacts of reducing air pollutants and CO_(2) emissions in urban road transport through 2035 in Chongqing, China 被引量:4
20
作者 Linfeng Duan Wei Hu +5 位作者 Di Deng Weikai Fang Min Xiong Peili Lu Zhenliang Li Chongzhi Zhai 《Environmental Science and Ecotechnology》 2021年第4期55-66,共12页
The road transport sector in megacities is confronted with pressing local air pollution and carbon dioxide(CO_(2))control issues.To determine effective policy instruments for saving energy and the co-control of air po... The road transport sector in megacities is confronted with pressing local air pollution and carbon dioxide(CO_(2))control issues.To determine effective policy instruments for saving energy and the co-control of air pollutants and CO_(2),several mainstream measures were examined and compared in Chongqing's road transport sector from 2017 to 2035.An integration assessment framework was developed by combining the Long-range Energy Alternatives Planning(LEAP)system and a set of quantitative methods for evaluating the co-benefits of emission reductions(including the air pollutant equivalent(APeq),cocontrol coordinate system,and pollutant reduction cross-elasticity(Elsa/b)).Results showed that the shifting transportation modes scenario presented the most significant potential for energy-saving and emission reductions,reducing energy use by 30.9%and air pollutants and CO_(2) emissions by approximately 27e32%compared with the business as usual(BAU)scenario in 2035.The improving energy efficiency scenario also provided significant co-benefits for reducing air pollutants and CO_(2) emissions.Nevertheless,the promoting alternative fuel scenario may increase fine particulate matter(PM2.5)emissions by 2.2%compared to BAU in 2035 under the cleanness of regional electricity in 2017.Our findings suggest that the shifting transportation modes were effective measures to reduce air pollutants and CO_(2) in the short term synergistically,and highlighted the importance of cleaner electricity generation to develop electric vehicles in the medium and long term. 展开更多
关键词 CO-BENEFITS air pollutants Carbon dioxide Energy consumption Road transport
原文传递
上一页 1 2 9 下一页 到第
使用帮助 返回顶部