2013年西安市大气污染物变化特征及成因分析研究

大气污染日益严重.对2013年西安市13个国控环境空气质量自动监测站的6种污染物项目进行分析,西安市首要大气污染物为细颗粒物（PM2.5）和可吸入颗粒物（PM1o）.二氧化硫、氮氧化物、细颗粒物和可吸入颗粒物污染物呈现出春冬高,夏秋低的趋势,为上抛物线型,相关系数为99％,且表现出污染源高度同源性;而臭氧污染趋势为夏秋高,冬春低,与气温的线性相关系数为96％.燃煤、机动车尾气、建筑扬尘是西安市大气污染三大污染源,大气污染防治必须多主要污染源共抓,不断减少污染物排放.

Formation and Variation Trends of Air Pollutants in Xi'an in 2013

Ambient air quality pollution is increasingly serious. In 2013, the air quality indexes in 13 automatic monitoring stations in Xi＇an are analyzed. The chief pollution indexes include PM2.s and PM10. The trend of sulfur dioxide, nitrogen oxides, PM2.5 and PM10 indexes form an up -parabola type, high in winter and spring, but low in summer and autumn. The four pollution indexes are high homologous and relativity is 99%. The trend of O3 index is low in winter and spring, but high in summer and autumn, while the linear relativity between O3 and temperature is 96%. The major three pollution sources are coal combustion, vehicle exhaust and soil dust. For a long term in the future, reducing multiple pollution sources at the same time is a reasonable measure for air pollution control.