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Sunlight activates smog-causing chemicals in city grime

from Scientific American

In recent years big cities have seen lower rates of crime. But there's still plenty of grime. Combustion from cars, factories and fires spews out nitrogen oxides. Those compounds react with sunlight and air to form ozone — the main ingredient in smog. And certain nitrogen oxides called nitrates — same stuff you find in fertilizer — also settle onto buildings and other city surfaces. Scientists figured that was the end of the story. more

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