复合型工业城市重空气污染过程大气污染特征

ATMOSPHERIC POLLUTANTS CHARACTERISTICS OF A SEVERE AIR POLLUTION EPISODE OVER THE COMPLEX INDUSTRIAL CITIES

以湘潭市地区2013年10月29日一次重空气污染过程为例,利用湘潭市空气自动监测站24小时连续监测数据,研究此次重空气污染过程大气污染浓度变化特征。结果表明SO2、NO2、PM10、CO、O3和PM2.5的日均值分别为105 ug/m3、117 ug/m3、542 ug/m3、2.583mg/m3、146 ug/m3、419 ug/m3,PM2.5污染最为严重,其日均浓度超出国家二级标准(75 ug/m3)4.59倍。SO2、NO2、PM10、CO、O3和PM2.5日变化显著,SO2和O3的日变化均呈单峰型,PM10、PM2.5、CO和NO2日变化均呈早晚双峰型。通过调查研究,这次污染事件的主要原因有极端不利的气象条件,近郊区大量焚烧秸秆以及PM2.5的区域污染传输。

Based on the Xiangtan city air automatic monitoring station for 24 hours continuous monitoring data, the characteristics of a severe air pollution episode which occurred over the Xiangtan city on October 29, 2013 was analyzed. The results showed that the daily average concentration of SO2, NO2, PM10,CO, O3 and PM2.5 during the observation period reached 105, 117, 542,2.583, 146 and 419 ug/m3,respectively.The PM2.5pollution of which daily average concentration exceeded the National Ambient Air Quality Standard II by 4.59 times was serious. There are obvious diurnal variation of SO2, NO2, PM10, CO, O3 and PM2.5. There is only one peak of SO2 and O3has been observed, however there are two peaks in sooner and later of PM10, PM2.5, CO and NO2 have been observed. Through investigation and study, the main causes of the contamination are extremely unfavorable weather conditions, burn of a large number of straws in suburbs and area transfer of PM2.5pollution.