【摘要】 统计了沈阳市2017年1月1日—2019年12月31日大气监测数据,分析了2019年大气中PM_2.5和PM₁₀质量浓度的变化特征.结果表明,全年天气质量以良为主,占比58.6%,污染天气共81 d.各季节空气质量按优级占比从大到小排列依次为秋季、夏季、春季、冬季.全年PM_2.5和PM₁₀日超标率分别为12.1%和7.7%.污染天气的AQI与PM_2.5、PM₁₀日均质量浓度的相关性系数分别为0.689和0.827,PM_2.5和PM₁₀是沈阳市污染天气中的首要污染物,月均质量浓度的最大值分别出现在2月和1月,二者最小值均出现在8月.PM_2.5和PM₁₀污染呈季节性变化,冬季污染最大,夏季则相反.各季节PM_2.5和PM₁₀的质量浓度比从大到小排列依次为冬季、夏季、秋季、春季.在2017—2019年中,PM_2.5年均质量浓度持续降低,PM₁₀污染呈反复趋势,PM_2.5和PM₁₀的质量浓度比有所降低.更多还原

【Abstract】 The atmospheric monitoring data of Shenyang City from January 1, 2017 to December 31, 2019 were collected, and the change characteristics of the mass concentration of PM_2.5 and PM₁₀ in the atmosphere in 2019 were analyzed. The results show that the weather quality in 2019 was mainly good, accounting for 58.6%, and there were 81 days of polluted weather. The air quality of each season in 2019 is ranked as autumn, summer, spring, and winter in descending order of the proportion of superior grade. The annual PM_2.5 and PM₁₀ daily exceedance rates are 12.1% and 7.7%. The correlation coefficients between AQI of polluted weather and PM_2.5 and PM₁₀ are 0.689 and 0.827, they are the primary pollutants in polluted weather in Shenyang. The maximum monthly average mass concentrations of PM_2.5 and PM₁₀ appeared in February and January, and the minimum of both appeared in August. PM_2.5 and PM₁₀ pollution showed seasonal characteristics, and the winter was most affected, summer reverse. The mass concentration ratios of PM_2.5 and PM₁₀ in each season are arranged in order of winter, summer, autumn and spring. In 2017-2019, the annual average mass concentration of PM_2.5 has continued to decrease, and PM₁₀ pollution has shown a repeated trend, PM_2.5/PM₁₀ has been reduced.更多还原