Does acid rain exist?

Acid rain refers to rain, snow or other forms of precipitation with pH less than 5.6. Acid rain is mainly caused by man-made discharge of a large number of acidic substances into the atmosphere.

Acid rain in China is mainly caused by burning a lot of coal with high sulfur content, mostly sulfuric acid rain, and less nitric acid rain. In addition, the tail gas emitted by various motor vehicles is also an important cause of acid rain. Some areas in China have become acid rain prone areas, and the scope and degree of acid rain pollution have attracted close attention.