Where is the problem of air pollution most severe?
rural areas
urban areas
mountain areas
coastal areas
In the urban areas is the problem of air pollution most severe.
Asked 12/1/2015 9:10:25 PM
Updated 12/2/2015 6:25:05 AM
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Edited by
selymi [12/2/2015 6:25:04 AM], Confirmed by
selymi [12/2/2015 6:25:05 AM]
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