Acid rain is a type of precipitation that has a lower pH than normal rainwater, making it more acidic. This phenomenon occurs when pollutants, such as sulfur dioxide and nitrogen oxides, are released into the atmosphere from sources like factories and vehicles. These pollutants can react with water vapor, forming sulfuric and nitric acids, which then fall to the ground as rain, snow, or fog. The effects of acid rain can be harmful to the environment. It can damage forests, harm aquatic ecosystems in lakes and rivers, and erode buildings and monuments made of limestone and marble. Acid rain can also affect soil quality, impacting plant growth and agriculture.