Since 20 13 1 month, there have been more "smog" weather in Beijing (pictured), and domestic parties are concerned about the air quality in the capital, which was proposed by Beijing Environmental Pro

Since 20 13 1 month, there have been more "smog" weather in Beijing (pictured), and domestic parties are concerned about the air quality in the capital, which was proposed by Beijing Environmental Protection Bureau. A, increasing the intensity of changing coal into electricity and gas, and promoting the use of clean energy can improve air quality;

B, strengthening the renewal of old motor vehicles and improving exhaust emission standards can improve air quality;

C, reducing students' outdoor exercise time and avoiding respiratory diseases has nothing to do with improving air quality;

D, do a good job in dust control and management of construction sites, can improve air quality.

So choose C.