Pollution is an issue of concern for years. It is a process that harmful substances are added to earth. There is a few form of pollutions such as air, water and land and etc.

Air pollution is released of gaseous pollutant from incomplete burning of fuels due to human activities.

Gaseous pollutant includes carbon monoxide(exhaust of vehicles), lead, carbon dioxide(burning of organic compound), nitrogen oxides, sulphur dioxide(burning of fossil fuel) and etc.

Cause of air pollution

• Burning of rubbish
• Chimney fumes from industries
• Exhaust fumes from vehicles
• Using chlorofluorocarbons in foam
  

Effect of air pollution

• Global warming
• Death
  
• Respiratory disease
• Depleting of ozone layer
• Acid Rain
  

Ways of reducing air pollution

• Install of catalytic converters in vehicles
• Take bus instead of private car
• Install filter on chimneys
• Use non-fossil fuels
• Use ozone friendly products
  

http://www.who.int/mediacentre/factsheets/fs313/en/index.html
This is a reliable source as it is from World Health Organisation and it latest update is at August 2008. It stated the statistic which support the fact.

In my opinion, I think that we can try to reduce air pollution by playing a part but not totally eliminate it by using the above ways that I stated. By reducing air pollution, we can get more refresh air and make the earth more "healthy". Imagine that in the morning when you wake up, you take a deep breath and the air turn up to be smoky gas. In order to prevent that to happen, let play a part to keep the earth and ourselves healthy. I had been doing my part, so do you?