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| Factories create smoke that pollutes the air |
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| Cars pollute the air every day |
Air pollution is the accumulation of hazardous substances into the atmosphere. A few things that contribute to air pollution are car emissions, tobacco smoke, the burning of coal, acid rain, aerosol sprays, and nuclear weapons. Car emissions are a big problem, they contribute 45% to global warming, and as more and more people drive gasoline powered cars, more of the atmosphere will become polluted. And it's not just the big cities that have polluted air, the wind can carry the bad air into the country, polluting it too. It is hard to know if a city has polluted air because it usually has no smell or color. Another huge part of air pollution is coal burning. Coal is usually burned to power homes, and with most buildings relying on this power it is easy to see why it is such a big part of air pollution. Learn more here.
Information from:
Scott, Sarah. "Smog Daze." ON Nature (Ontario, Canada) Vol. 46, No. 2. Summer 2006: 18-23. SIRS Researcher. Web. 17 Nov 2010.
http://www.greenstudentu.com/encyclopedia/pollution
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