In 2021, the number of days with good air in Beijing reached 288, and the number of days with heavy pollution was only 8.

　　On the morning of the 4th, the Information Office of Beijing Municipal People’s Government held a press conference on the air quality in Beijing in 2021. Yu Jianhua, deputy director and spokesperson of the Municipal Bureau of Ecology and Environment, said that in 2021, the number of excellent days in Beijing reached 288, accounting for 78.9%, close to 80%; Compared with 2013, it has increased by 112 days, which is equivalent to nearly four months more excellent days in 2021 than in 2013. Among them, the number of first-class excellent days in 2021 was 114 days, an increase of 73 days compared with 2013, and the blue sky background was purer and the "gold content" was more sufficient.

　　While the blue sky increased significantly, the days of heavy pollution decreased significantly, and the occurrence frequency, peak concentration and duration all decreased significantly. In 2021, there were 8 days of heavy pollution, 50 days less than in 2013, with a drop of 86.2%. Heavy pollution of PM2.5 in summer and autumn is basically eliminated.