Which of the following air pollutants cause acid rain?

Acid rain is caused by oxides of nitrogen and sulphur dioxide, which form nitric and sulphuric acids.

Statement 1, nitric oxide, contributes as a nitrogen oxide that forms nitric acid.

Statement 2, nitrogen dioxide, likewise yields nitric acid in the atmosphere.

Statement 3, carbon monoxide, is a toxic pollutant but does not cause acid rain.

Statement 4, sulphur dioxide, forms sulphuric acid and is a major cause.

Statement 5, methane, is a greenhouse gas and plays no acid-rain role.

These acids lower rainfall pH and damage soils, lakes and buildings.