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Causes and effects of Air pollution.

Answer Text:
Air pollution.
-Addition of toxic and harmful substances in to the air which destroy its purity.
Causes:
-Eruption of volcanoes which releases poisonous gases, dust and ash particles to the atmosphere.
-Natural fires started by lava flows and lightning
which add a lot of smoke into the air.
-Industrial emissions e.g. sulphur dioxide, carbon dioxide, hydrocarbons etc.
-Dust and carbon particles added by quarrying and factories,
-Tanneries which release large quantities of hydrogen sulphide and ammonia into the atmosphere.
-Smoke and poisonous gases from motor vehicle emissions.
Effects:
-Sulphur dioxide and nitrogen dioxide combine with water vapour forming acidic water which corrodes buildings.
-Sulphur dioxide also combines with oxygen forming a dilute mixture of sulphuric acid which
damages forests, ancient buildings and sculptures.
-Lead released into the air from leaded fuels is absorbed by vegetables which are eaten by human beings and animals causing sickness resulting from poisoning.
-Large quantities of smoke contribute to formation of smog in industrial cities such as Beijing.
-Hydrocarbons cause depletion of ozone layer leading to excess UVR reaching the surface which accelerates global warming and causes problems such as skin cancers, deterioration of plastics etc.
-Air pollution also causes respiratory problems and also aggravates respiratory diseases such as asthma respiratory