Abstract
In this study, a time change analysis of fine particulate (PM2.5) emission in multi-resolution emission inventory in China (MEIC) from 2013 to 2016 was conducted. It was found that PM2.5 emissions showed a decreasing trend year by year, and that the annual total emission of PM2.5 decreased by 28.5% in 2016 compared with that of 2013. When comparing the observation data of PM2.5 and ozone (O3), it was found that both PM2.5 and O3 show obvious seasonal changes. The emission of PM2.5 in autumn and winter is higher than that in summer, while that of O3 is not. Our study showed that in the 2015–2020 period, annual mean concentrations of PM2.5 and O3 in Beijing varied from 80.87 to 38.31 μg m−3 and 110.75 to 106.18 μg m−3, respectively. Since 2015, the observed value of PM2.5 has shown an obvious downward trend. Compared with 2015, the average annual PM2.5 concentrations in Beijing, Shanghai, Xuzhou, Zhengzhou, and Hefei in 2020 had decreased by 52.62%, 40.35%, 22.2%, 46.84%, and 45.11%, respectively, while O3 showed an upward trend. Compared with the annual averages of 2015 and 2020, Beijing and Shanghai saw a decrease of 4.13% and 8.46%, respectively, while Xuzhou, Zhengzhou, and Hefei saw an increase of 7.08%, 19.46%, and 41.57%, respectively. The comparison shows that PM2.5 is becoming less threatening in China and that ozone is becoming more difficult to control. Air pollution is a modifiable risk factor. Appropriate sustainable control policies are recommended to protect public health.
Highlights
In the past three decades, with the rapid growth of China’s economy and the rapid advancement of industrialization and urbanization, China’s environmental pollution problems have become more and more serious
In 2016, compared with 2013, the annual PM2.5 emissions decreased by 28.5%, and the average annual decrease was about 10%
We found opposite trends of PM2.5 and ozone in the past six years
Summary
In the past three decades, with the rapid growth of China’s economy and the rapid advancement of industrialization and urbanization, China’s environmental pollution problems have become more and more serious. 2017, with regard to statistics in 2017, of the more than 338 cities in China there are 99 cities with standard ambient air quality, accounting for 29.3% of the total number of cities; and there are 239 with urban environmental air quality, accounting for 70.7%. These 338 cities had 2311 days of high pollution and 802 days of very high pollution, with PM2.5 as the primary pollutant (accounting for 74.2 percent of the days with heavy pollution) [6]. Compared with that before 2017, the air quality of the whole year was significantly improved, which shows that the pollutant emission list is the basis of air pollution control according to the report on the ecological environmental condition in China in 2020. This paper will compare and analyze the emission changes in PM2.5 and O3 in recent years
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
