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Name: Pleasant Lane
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Why do so may trucks have big black smoke coming out of them? Is that pollution?

Yes, that black smoke you see is a form of pollution called "PAH" for "poly- aromatic-hydrocarbons" (which is basically just a fancy word for "black smoke that comes from trucks"). It may be hard to believe, but just because you can see and smell the fumes coming out of trucks and busses does not mean that trucks and busses pollute more than cars. One of the worst kinds of pollution from cars is completely invisible and has no smell at all - it is called "carbon monoxide" gas.


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