Newsweek _ Thousands of Americans have been urged to avoid driving amid concerns over high air pollution levels. The National Weather Service (NWS) issued air quality alerts in Colorado, Arizona, Wyoming and Florida on Thursday. The warnings mean ground-level ozone and particulate concentrations are forecast to reach dangerous levels. In some areas, the pollution comes from drifting wildfire smoke.
The NWS warned that the general public as well as sensitive groups—children, seniors and individuals with preexisting respiratory or heart conditions—might experience health effects linked to poor air quality in the affected regions.
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