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Tennille Brooks

When officials declare an Air Quality Action Day due to high ozone levels, those who exercise vigorously outdoors are at increased risk of breathing problems, as are children, the elderly, and those with lung diseases such as asthma. (Credit: CBS)

Extreme Heat Brings Air Quality Action Warning For Chicago

Thursday’s extreme heat brings double trouble to the Chicago area. Not only is the heat dangerous, but the air conditions could make it hard for some people to breathe.

CBS Chicago–06/27/2012