Cities
Air pollution is usually concentrated in densely populated metropolitan areas, especially in developing countries where environmental regulations are relatively lax or nonexistent. However, even populated areas in developed countries attain unhealthy levels of pollution with Los Angeles and Rome being two good examples.
Read more about this topic: Air Quality
Famous quotes containing the word cities:
“We are in danger ... of making our cities places where business goes on but where life, in its real sense, is lost.”
—Hubert H. Humphrey (1911–1978)
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