Answers

2014-08-14T20:05:55+08:00
Factories, burning fossil fuel,  smoking cigarettes and car smoke....
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  • zzz
  • Helping Hand
2014-08-14T20:07:03+08:00
Car exhaust
Factory smoke emission
Human made chemical vapor
Dust
Smoke from burning (anything)

--These are all air pollutants because all of this negatively affect the condition of air in a certain area-- 

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