Beijing is currently working on a three-year blue-sky action plan, aiming to significantly improve the air quality through continuous efforts over three years, said Fang Li, director general of Beijing Municipal Environmental Protection Bureau, at the 2018 International Metropolis Clean Air Forum in Beijing on July 5.

According to Beijing's 13th five-year plan for the prevention and control of air pollution, the city's average annual concentration of PM2.5 in 2020 will be about 56 micrograms per cubic meter, approximately 30 percent lower than that in 2015.

Fang said sources of air pollution in the city have changed fundamentally, adding that motor vehicles, solvents, the catering industry and other sources from social and daily life are now the main pollution sources, which cannot be addressed with a single measure.

While drawing on experience of air pollution control from international metropolises, Beijing has formulated its own air pollution control system based on 20 years of exploration and practice, according to Fang.

The city and the United Nations Environment Program have commissioned a panel of experts to summarize its 20-year experience, and Beijing would like to share it, Fang said.

The city's air quality has been improving for 19 consecutive years, Li Xiang, an official from Beijing Municipal Environmental Protection Bureau introduced. He said Beijing is the first city in China that has basically solved the problem of sulfur dioxide pollution from burning coal and has practically set up an air quality monitoring network.