Air quality in the mountains near the foggy city

In foggy days, the open air in the environment is conducive to the evacuation of smog, and the environment is narrow and closed, making it difficult to remove smog. Therefore, the smog in urban areas is generally more serious than that in suburbs. Of course, if the suburb happens to be a factory sewage disposal site, it will be even more serious. Therefore, the air quality in the mountains near the city depends on the pollution situation of the whole city and whether there is sewage around it. Don't climb mountains in foggy weather. Climbing a mountain will lead to faster breathing and more smoke. Smog filter cotton should also be posted at home, and the number of Soudian 1 should be guaranteed. The screen window of air conditioner purifier can filter smog, and it is safe after filtering.