摘要
分析华北地区近年来大气颗粒物污染水平的变化规律,可为环境空气质量指数的科学评价提供对比参考,并为区域空气污染防治提供科学依据。该文基于国家环保部对外公布的城市空气质量日报,分析了华北地区空气污染指数(air pollution index,API)变化规律及其与气象要素的相关性。结果表明,2003-2012年华北地区年平均API大致呈波动下降趋势,轻度污染及以上级别出现天数减少,空气质量总体有转好趋势;API季节变化差异显著,冬、春季平均API较高且大致呈下降趋势,但API急剧增大的重污染事件发生频率增加。气象要素与API变化关系密切:月平均气温、相对湿度与API大致呈显著负相关;月平均气压与API则呈显著正相关。
Analyzing the change regulation of particulate pollution levels of North China in recent years can provide reference for evaluating the air pollution index(API) scientifically, and provide scientific basis for the regional air pollution control. In this study, daily air quality announced by State Department of Environmental Protection are used to analysis the variation of air pollution index and the correlation between API and meteorological elements in North China. The results showed that annually and seasonal average API decreased, the total days of low-grade and above pollution level reduced in North China from 2003 to 2012, air quality changed well gradually. Meteorological factors correlated with API closely: monthly mean temperature, humidity have significantly negative effects on API; monthly mean pressure has positive correlation effect.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2015年第S2期120-127,共8页
Environmental Science & Technology
基金
国家重点基础研究发展计划(973计划)项目(2012CB955403)
江苏省自然科学基金项目(BK20140996)
关键词
API
大气颗粒物
气象要素
华北地区
air pollution index(API)
atmosphere particulate
meteorological elements
North China
