Millions of Americans have been urged to watch out for unusual fatigue and palpitations amid concerns over high air pollution levels.

The National Weather Service (NWS) issued a series of air quality alerts on Tuesday for large swathes of Minnesota, Wisconsin, New York, Connecticut, New Hampshire, Rhode Island, Massachusetts, Colorado, Texas and California.

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.

Why It Matters

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.

"People

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