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Several U.S. cities are experiencing heightened air pollution levels on Wednesday, including parts of Chicago.

In part, we owe our existence to a process called the greenhouse effect. Inside an artificial greenhouse filled with plants ... nitrous oxide, ozone, and chlorofluorocarbons (CFCs).

Nearly half of Americans in the U.S. live in areas with failing air quality, according to the American Lung Association’s ...

The LA area is once again the worst for ozone in the U.S., a pollutant impacting millions more people nationwide, the ...