| A | B |
|---|
| H2SO4 | Main cause of acid rain |
| HNO3 | Causes some of the acid rain |
| acid rain | rain which has a pH in region of 4/5 |
| NO2 | nitrogen dioxide |
| SO2 | sulphur dioxide |
| pollutants | substances which should not be present in the air |
| H2CO3 | causes natural acidity of rain water |
| volcanoes | naturally produce SO2 |
| ozone | O3 |
| sulphur | High content in some coal deposits |
| ChloroFluoroCarbons(CFC's) | destroys ozone layer |
