China News Service, Beijing, February 26 (Chen Hang) The reporter learned from the Beijing Municipal Department of Ecology and Environment that the Beijing Heavy Air Pollution Emergency Command Office is scheduled to initiate a yellow warning for heavy air pollution at 16:00 on the 26th.
According to the actual air quality and the latest forecast and forecast analysis, affected by the adverse weather conditions such as regional transmission and warming, low pressure, temperature inversion, and high humidity, the air quality in Beijing reached a moderate pollution level during the day on February 26; it is expected that at night on the 26th, Superimposed on the impact of the launch of fireworks and firecrackers during the Lantern Festival, pollution will further aggravate and reach a severe pollution level.
On the 27th, the diffusion conditions continued to be unfavorable, and the air quality will maintain a heavy pollution level; it is expected that the air quality will gradually improve on the 28th due to the impact of precipitation.
It is reported that during the yellow warning period, Beijing strictly implemented the prohibition and restriction of fireworks and firecrackers; stopped outdoor construction sites spray painting, slope protection shotcrete, building demolition, cutting, earthwork and other construction operations; increased 1 or more cleaning and cleaning of key roads a day Operations: The enterprises included in the emergency emission reduction list shall implement measures to stop production and limit emission reduction in the gas-related pollutant discharge process in accordance with the principles of heavy pollution performance rating and differentiated management and control.
The Beijing Ecological Environment Monitoring Center previously stated that the Lantern Festival is the last peak of fireworks and firecrackers during the Spring Festival, which often has a significant adverse impact on Beijing’s air quality and significantly increases air pollution levels. If adverse weather conditions are encountered, pollutants will be released and accumulated , Will further increase air pollution.
First, the launching of fireworks and firecrackers during the Lantern Festival will cause the PM2.5 concentration to rise rapidly, forming a significant pollution peak.
The peak concentration of the Lantern Festival occurred at 19-24 o'clock. The peak concentration in 2013-2017 was significantly higher, reaching about 500 micrograms/cubic meter, which is a serious pollution level. In 2018-2020, due to the implementation of bans and restrictions and the public’s With active cooperation, the discharge intensity has been reduced, and the peak concentration has dropped significantly, but it can still reach about 150 micrograms/m3, which is at a moderate to severe pollution level.
Second, the display of fireworks and firecrackers significantly aggravated the air pollution in Beijing.
From the statistics of PM2.5 pollution levels during the Lantern Festival in 2013-2020 and the 16th of the first lunar month, there were 3 days of light pollution, 3 days of moderate pollution, and 5 days of heavy pollution. Among them, 3 days were severe pollution, with an exceeding rate of 68.8% , The heavy pollution rate reached 31.3%.
Third, if unfavorable weather conditions are encountered, the discharge of pollutants will stay and accumulate, which can form a continuous process of heavy air pollution. During the Lantern Festival in the past eight years, there have been seven years of moderate-to-severe air pollution processes of grade 4-5 lasting about 3 days. Taking the Lantern Festival in 2020 as an example, due to unfavorable diffusion conditions, Beijing and the region's discharge of pollutants stagnated, resulting in a three-day continuous heavy pollution process in the city, which significantly increased the city's air pollution level. (Finish)