This Feb 28, 2012 photo shows Zhang Zhijie, an emission management official with the environmental protection bureau of Beijing’s Chaoyang district, tests monitoring equipment near a park. (GENG FEIFEI / CHINA DAILY)

BEIJING – High-emission vehicles will be taken off all roads in Beijing to help fight smog, a city official said Wednesday.

A new action plan will be finalized to fight air pollution, bolstering further enforcement efforts at the grassroots level, said Chen Jining, acting mayor of Beijing.

READ MORE: New steps to tackle air pollution set for Beijing region

He was addressing the opening of the first annual session of the 15th Beijing Municipal People's Congress.

Currently, vehicles with high emissions are forbidden within the Sixth Ring Road.

Vehicle exhaust, industrial emissions and coal use are among the main causes of air pollution, and analysis into pollutant formation will help root out significant pollution sources, according to officials.

This year, smog control in the capital will be based on the analysis of the sources of PM2.5 pollutants, Chen said, pledging all-out efforts to reduce the average PM2.5 density.

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The average density of PM2.5 in Beijing was 58 micrograms per cubic meter last year, which met the target set by the State Council and was 20.5 percent less than in 2016.