Millions of Americans have been advised to monitor palpitations and unusual fatigue amid concerns over high air pollution levels.
Air quality alerts have issued on Monday across large swathes of Wisconsin, Michigan, Pennsylvania, New York, Massachusetts, Vermont, Maine, Delaware, Texas and Colorado, according to the National Weather Service (NWS).
The warnings mean ground-level ozone concentrations are forecast to reach dangerous levels.
Why It Matters
The NWS warned that both sensitive groups—such as children, seniors, and individuals with preexisting respiratory or heart conditions—and the general public might experience health effects linked to poor air quality in the affected regions…