China Naming Network - Weather knowledge - （213? Texas) Since January 213, the central and eastern parts of the country have been caught in severe smog and polluted weather, as shown in the figure. The Central Meteorological Observatory has turned the fog blue.
（213? Texas) Since January 213, the central and eastern parts of the country have been caught in severe smog and polluted weather, as shown in the figure. The Central Meteorological Observatory has turned the fog blue.
A, increasing the intensity of coal to electricity and coal to gas, and promoting the use of clean energy can improve air quality;
B, the air quality can be improved by strengthening the renewal of old motor vehicles and raising the exhaust emission standards;
C, reducing students' outdoor exercise time and avoiding respiratory diseases has nothing to do with improving air quality;
D, limiting the setting off of holiday firecrackers and reducing the emission of harmful gases can improve air quality.
Therefore, C. 。