For the second time this month, massive plumes of smoke from hundreds of out-of-control Canadian wildfires are polluting much of America's air.
Among the major U.S. cities now experiencing poor air quality are St. Louis, Milwaukee, Cincinnati and Chicago, while entire states have also issued air quality alerts, according to the National Weather Service.
These are Delaware, Illinois, Indiana, Iowa, Maryland, Michigan, New York and Wisconsin. Parts of Kansas, Minnesota, Missouri, North Carolina, Ohio, Pennsylvania and Virginia also have alerts. In the cities of Chicago, Cleveland, Detroit, Indianapolis, Milwaukee, Pittsburgh and Davenport, Iowa, air quality was in the “very unhealthy” range, according to airnow.gov.
The air quality is cause for concern because of tiny particulate matter, also called PM2.5, which is a dangerous pollutant. It can travel deep into the lung tissue and enter the bloodstream, according to the U.S. Centers for Disease Control and
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