Air pollution is caused by harmful gases such as carbon dioxide (carbon dioxide is itself not a "harmful pollutant" because people breathe it in normally without consequence), sulphur dioxide, nitrogen dioxide carbon monoxide and very small particles of carbon. It is also caused by the smoke and harmful gases released by the fires that make vehicles and factories go. Use of coal, wood and kerosene as fuels for fire also causes air pollution. Air pollution may cause breathing problems such as asthma or other health problems. It also causes diseases like cancer.
Air pollution causes global warming and acid rain. It results in increased temperatures erratic rains and drought worldwide. This makes it difficult for the living organisms to survive