For many people in northern China, air quality is one of the top problems when winter comes.
On Nov 23, 2019, a serious haze (雾霾) appeared in Shijiazhuang, Hebei. Local government paid much attention to the heavy air pollution. It was not the first time that Hebei had been in a haze last year. According to the government, burning coal for heat is the main reason for air pollution in winter in the province. Air pollution is usually more serious in winter than in other seasons.
At the same time, last year's warm weather brought other bad impacts. Higher temperatures and less rainfall increased ozone density (臭氧浓度)and made a haze harder to disappear.
To stop pollution from getting worse, some action was taken by the government. The goal was to reduce PM2.5 density in some cities. As a result, the average density of PM2.5 in Beijing, Tianjin and Hebei dropped. Also, the number of days with serious pollution in these areas fell.
China has worked to improve the environment. Great efforts have been made to fight air pollution. From 2015 to 2019, more and more Chinese cities have improved their air quality. Beijing has set a good example to other cities in fighting air pollution. It has shared its experience with other cities in the world.
