A corner tower of the Forbidden City under the blue sky in Beijing, China. (Photo: CGTN)

China has seen notable improvement of air quality in key regions thanks to its efforts in air pollution control since the beginning of the year, environmental authorities said on December 26.

In the Beijing-Tianjin-Hebei and surrounding regions, the number of days with good air quality in November jumped 18.6 percentage points year on year to 63 percent, data from the Ministry of Ecology and Environment (MEE) showed.

According to Liu Youbin, a spokesperson for the MEE, these areas also saw the density of PM2.5, fine particulate matter that causes smog, slip by 25.9 percent to 63 micrograms per cubic meter last month.

Other areas also reported improved air quality during the January-November period, with the density of PM2.5 in China's central and southwestern regions dropping by 22 percent and 13 percent year on year, respectively.