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air pollutants

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air pollutants

Postby crawfsm » Thu Mar 17, 2005 1:52 am

concentration of air pollutants highest when?
12 a.m.
6 a.m.
12 noon
6 p.m.
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Postby mith » Thu Mar 17, 2005 4:30 am

6:00pm rush hour (home) traffic time.
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Postby MrMistery » Thu Mar 17, 2005 6:16 pm

In a city, it is about 4-6 pm, as mithrill said
Outside the city it's constant i guess
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