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Acid rains are produced by

1. excess emissions of NO2 and SO2 from burning fossil fuels
2. excess production of NH3 by industry and coal gas
3. excess release of carbon monoxide by incomplete combustion
4. excess formation of CO2 by combustion and animal respiration

Correct answer: excess emissions of NO2 and SO2 from burning fossil fuels

Solution

Acid rain is caused by the release of nitrogen dioxide (NO2) and sulfur dioxide (SO2) into the atmosphere, which react with water to form nitric acid and sulfuric acid, respectively.

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