5.12 understand that nitrogen oxides and sulfur dioxide are pollutant gases which contribute to acid raid, and describe the problems caused by acid rain

Sulfur dioxide mix with clouds forming dilute sulfuric acid, which is very acidic. Nitrous oxide also mixes with clouds, forming nitric acid. These fall as acid rain which causes lakes to become acid in (killing plants and animals), kills trees and damages limestone buildings and statues.

There have also been links made between acid rain and human health although these are not proven.