气象和排放变化对PM<sub>2.5</sub>污染的定量影响

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Abstract The WRF-CMAQ modeling system was employed to investigate the impact of meteorological conditions and emission reduction on PM_2.5 pollution in China. The results indicate that the PM_2.5 concentration observed in 2016 and 2017 decreased by 7% and 14%, respectively compared with that in 2015, indicating an evident improvement in air quality. In 2016, the decrease in PM_2.5 concentration owning to meteorological factor and emission reduction were estimated to be 4% and 3%, respectively. The impact of meteorological factors in 2017 showed little difference compared with that in 2015, which implied that the decrease of emissions was the decisive factor to PM_2.5 decline. In the key regions except for the Fenwei Plain, such as Beijing-Tianjin-Hebei and surrounding region (‘2+26’ region), the Yangtze River Delta (YRD), the Pearl River Delta (PRD) region and the Chengdu-Chongqing (CYB) region, the observational concentration decreased steadily. In the PRD region, an increase of 29% in PM_2.5 concentration in 2017 could be attributed to the variations of meteorological conditions. Except for the FenWei plain, the decrease of emissions contributed to a larger drop in PM_2.5 concentration in 2017 in the other key regions. The results indicated that the emission cuts generally improved the air quality. The analytical methods presented in this paper could be referred when setting air quality goals or estimating environmental benefit of pollution control plans.

Key words： WRF-CMAQ model PM_2.5 pollution meteorological emission quantitative impact

Received: 29 April 2019

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X513

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	XU Yan-ling
	XUE Wen-bo
	LEI Yu

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XU Yan-ling,XUE Wen-bo,LEI Yu. Impact of meteorological conditions and emission change on PM_2.5 pollution in China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4546-4551.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I11/4546

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