China News Service, Beijing, January 9th (Chen Hang Duyan) After the outbreak of the new crown pneumonia in 2020, Beijing's industrial and living activities have dropped sharply, but heavy pollution weather still appeared.

Liu Baoxian, director of the Beijing Eco-Environmental Monitoring Center, said in an exclusive interview with China News Agency "China Focus" that pollution emissions are greater than environmental capacity. Although pollution emissions have been reduced by the epidemic, they have not been desensitized to weather conditions.

　　Liu Baoxian pointed out that the epidemic provides an important scenario to analyze the situation of these pollution sources.

At the beginning of the epidemic, there was a heavy pollution process from February 11 to 13, 2020.

　　"Everyone has questions about why the car stopped, the level of production activities has dropped, and there is pollution. In fact, we have done a detailed analysis." He said that although pollutant emissions have been reduced in all aspects at the time, overall, the city has dropped. More, but less in rural areas; February is the heating season and there is a lot of heating demand; light industry stops a lot, heavy industry stops less, such as steel, glass, coke, and other heavy industries basically never stop.

　　He said that the total emissions of pollutants in the entire Beijing-Tianjin-Hebei region are relatively large.

Under extremely unfavorable weather conditions, heavy pollution will still occur.

For example, Beijing is prone to weather conditions such as low air pressure, temperature inversion, and high humidity in autumn and winter. In addition, this period is the heating season, and pollutant emissions increase accordingly, and it is necessary to make great efforts to reduce the total pollution as much as possible.

　　He mentioned: In February 2020, extremely adverse weather conditions occurred in Beijing.

The boundary layer is equivalent to the vertical diffusion space of atmospheric pollutants. It dropped from 1500 meters to about 300 meters within a few days. The pollutants originally spread in a space of 1500 meters, but now they can only diffuse in a space of 300 meters, and the concentration of pollutants has increased. Several times.

In addition, during those few days, the temperature was relatively abnormal, and the atmospheric structure above the ground showed an abnormal phenomenon that the temperature increased by nearly 10 degrees with the increase in altitude, forming a "temperature inversion", "like a bed quilt", and pollutants diffused. Even worse.

In addition, the Beijing area is at the center of the convergence of air currents, and the pollution of the entire region is concentrated here. "In fact, it is not just Beijing. There will be pollution in every city this pollutant goes to."

　　How can we harvest more blue sky?

Liu Baoxian emphasized that in the longer term, the fundamental lies in the long-term pollution reduction, pollution is becoming less and less, and the impact of meteorological fluctuations will be lower and lower. “There is no way to control extreme adverse weather conditions. "Efforts to reduce emissions" "need continuous efforts from everyone in the future."

　　Speaking of air quality in the first quarter of 2021, Liu Baoxian said that it should be said that the first half of January this year was good, but it will be slightly worse in the second half of this year.

From February to March 2021, as the temperature rises and cold air activity decreases, the overall diffusion conditions will be relatively worse.

　　"Of course, this kind of long-term forecast has certain uncertainty. We will follow up on the approaching forecast and release relevant information." Liu Baoxian believes that only by mobilizing the power of the whole society can air pollution control be more efficient. Can be further shortened.

(Finish)