中國氨排放對PM2.5污染的影響

2020-04-01 365體育直播平臺 閱讀

  For PM2.5 pollution investigation in China, the air quality modelling system WRF-CMAQ was applied to calculate the impacts of ammonia emission on PM2.5 concentration. The results indicated that ammonia emission had the biggest contribution for secondary nitrogen particles, with annual average 99.8%for nitrate, 99.7%for ammonium, while only 4.2%, 29.8% for sulfate and PM2.5 respectively. Quantification of ammonia emission impacts on PM2.5 mass concentration were also conducted in January, April, July and October as representative months, counted 20.15μg/m3, 12.39μg/m3, 13.20μg/m3 and 14.20μg/m3, respectively, with January ranking the first in monthly average contribution. It’s general that ammonia emission had dramatical influence on PM2.5 in regions where agriculture and animal husbandry well developed, such as Henan, Shandong, Hubei and Hebei province, with annual average contribution all exceeded 20μg/m3. In view of this, ammonia emission control will lead to significantly decrease of nitrate and ammonium, therefore reduce the PM2.5 pollution level.

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