The Relationship between Ozone over Standard and Nitrogen Dioxide in Shihezi in Summer

By analyzing O3 concentration,NOx concentration and intensity of illumination in Shihezi City in summer of 2015-2018,the relationship between O3 concentration and NOx concentration in summer was obtained.The results showed that O3 concentration rise was 14 h later than NO2 concentration rise when O3 concentration exceeded the standard in Shihezi in summer.Meanwhile,NO2 concentration had certain effect on O3 formation.

Comparative Analysis on Two Kinds of Measurement Methods of Particulate Matters in Waste Gas of Low Velocity

In the current waste gas sampling of fixed source,it is required that deviation of tracking rate of constant velocity sampling should not be more than 10%.When flow rate of the waste gas is less than 5 m/s,the tracking rate can not meet this requirement.The sampling of fixed velocity can meet the requirement of particulate matter sampling on gas collection volume at low velocity.Through the comparison of two different methods for the determination of particulate matter in waste gas under the low flow velocity of flue gas,it was found that there were some differences between the fixed velocity measurement and the constant velocity measurement.The results showed that measurement result of the fixed velocity was higher than that of constant velocity measurement under low velocity.At the same time,the deviation of fixed velocity measurement was not obvious under different low velocity.

Analysis on Content and Distribution of Residual Film in Fields of Different Crops

Before spring ploughing in 2019,the representative fields of the 8^(th) Division were selected,and residual film at different depths of soil in three areas of the 8^(th) Division was collected. Through the analysis on the weight and amount of residual film at different depths of soil,it was found that the average content of residual film in the 8^(th) Division was 104 kg/hm^2. From high to low,the content sequence of residual film in the three areas was Anjihai area,Mosuowan area and Xiayedi area. The average amount of residual film collected from the cotton field in the three areas was greater than that from the corn field. In the three areas,the content of residual film in the cotton field at the depth of 0-10 and 11-30 cm was higher than that in the corn field,while the content of residual film at the depth of 31-50 cm in the corn field was higher than that in the cotton field.

Analysis on the Current Situation, Impact and Source of Atmospheric Ozone Pollution in China

With the gradual improvement of PM 2.5 pollution in China,the problem of ozone pollution is becoming more and more serious.In recent years,ozone has become the only one of the six major air pollutants increasing year on year in China,and the primary pollutant of air pollution in many cities of China in summer.In this paper,pollution characteristics of ozone and its relationship with meteorological conditions in China s provincial capitals and some economically developed cities(27 cities in total),and temporal-spatial distribution rules of ozone in China were analyzed,and influence and main source of ozone in China were summarized.The results were as below:daily change of ozone concentration showed as single-peak type,and the maximum generally appeared at 15:00-16:00,while the minimum generally occurred at 07:00-08:00.Seasonal change of ozone concentration mainly showed as single-peak type.In summer,ozone concentration was the highest,followed by spring and autumn,and its concentration in winter was the lowest.The influence of meteorological factors on ozone showed as that there was significantly positive correlation between ozone and temperature,radiation quantity,and significantly negative correlation between ozone and humidity,NOx.Ozone near surface will have adverse effects on biosphere,climate and ecological environment.The source of ozone can be divided into two kinds:man-made and natural,and the most important source of near-surface ozone is man-made.