酸性雨
The primary concern of air pollution is how widespread the pollution can become in a short period of time. Acid rain is one of the largest forms of pollution today. The issue with acid rain is that it affects literally every living organism it comes in contact with, whether that be trees in a forest, water in an ocean or lake, or the skin of humans and animals. Typically, acid rain is a combination of sulfur dioxide and nitrogen oxides that are emitted from factories. If it is not controlled in a timely manner, it could lead to loss of life due to the dangerous nature of the composition of the rain.