遂宁市大气细颗粒物污染现状及成因

Status and causes of PM_(2.5) pollution in Suining City of China

通过研究遂宁市环境空气质量变化趋势、城区空气颗粒物组成及浓度变化,系统分析了遂宁市雾霾天气的污染状况及成因,并横向比较了四川省内各城市的空气质量.研究结果表明,细颗粒物(PM2.5)是遂宁市环境空气中的主要污染物.2012年遂宁市大气中PM2.5浓度值为35—119μg·m-3,平均值为68μg·m-3.2013年1—4月,PM2.5浓度值为21—120μg·m-3,达标率不到50%.尤其在2013年3月,PM2.5/PM10由62.0%—87.2%降低为45.3%.由此判断遂宁市环境空气质量主要受细颗粒物类型、气象条件以及大气污染物长距离迁移等因素影响,其中细颗粒物的最主要来源为机动车尾气排放,并提出了细颗粒物污染防治的对策措施.

The paper analyzes systematically the air pollution situation and the causes of the fog and haze in Suining City by studying the air quality trend,variation of composition and concentration of airborne particulate matter in the city. And the horizontal comparison is also conducted among cities of Sichuan Province. The fine particulate matter （PM2.5） concentration in Suining City ranged from 35 μg·m-3 to 119 μg·m-3, and the average value is 68 μg·m-3 in 2012. While the PM2.5 concentration in Suining ranged from 21 μg·m-3 to 120 μg·m-3 from January to April in 2013,the qualification rate was below 50%. Especially in march 2013,PM2.5/PM10 decreased from 62.0%—87.2% to 45.3%. Judged by the data,the air quality in Suining City is mainly affected by pollution pattern of fine particulate matters,climate conditions and long-distance transportation of the air pollutants. And the main source of fine particulate matters is motor vehicle exhaust. The countermeasures to prevent and control particulate matter pollution were put forward accordingly for the city.