Traditional Culture Encyclopedia - Weather forecast - What weather conditions are conducive to improving air conditions?

What weather conditions are conducive to improving air conditions?

The air quality grade is judged according to the concentration of pollutants in the air, which can reflect the degree of air pollution. The air pollution is serious and it is prone to haze weather. Measures to improve air quality include: prohibiting the burning of plant straws, advocating public transportation, planting trees and advocating a low-carbon life; Combination options.

So choose: a.