Acid rain is a rainfall or atmospheric moisture that has been mixed with some pollutants that has made the mositure more acidic than usual. Chemicals produced as a result of burning fuels are the main reasons behind the formation of acid rain. Sulphur dioxide and Nitrogen dioxide are some of the harmful gases which when produced as a result of burning fuel, reacts with tiny water droplets to produce sulphuric and nitric acid. Hence rain fall as a result is known as acid rain. 

There are many harmful effects of acid rain. Some of them are listed below:

• Acid rain causes acidifcation of lakes and streams.
• Acid rain damages trees at high elevation.
• Acid rain also damages many sensitive forest soils.
• Acid rain accelerates the decay of building materials and paints.
• Acid rain impacts human health.