Parts of the Northeast and Midwest were shrouded in smoky, hazy skies on Thursday, while also grappling with record-high temperatures. Cities including Toledo, Milwaukee, and Detroit saw Air Quality Index (AQI) levels of over 500 on Thursday—far surpassing the level of 300 that indicates hazardous air quality.
“When the AQI climbs into the 150+ range for a full day outside, that’s in the ballpark of [smoking] seven to nine cigarettes,” Dr. Jonathan M. Tan, division chief of General Anesthesiology at Children’s Hospital of Philadelphia, told AccuWeather.
Local officials and health experts urged people in areas grappling with poor quality to stay inside as much as possible and avoid strenuous activity. They recommended that people who need to go outside wear N95 masks to protect themselves from inhaling the polluted air as much as possible.
In Toledo, the AQI on Friday was still over 300. Those levels are expected to drop down to the 100-200 range by Saturday, according to AccuWeather’s forecast, though that is still considered unhealthy to very unhealthy. AccuWeather predicted that the unhealthy levels in Toledo, as well as in Milwaukee and Detroit, may persist throughout the weekend into Monday.
In the nation’s capital, the AQI was around 200 on Friday. Forecasters predicted that the poor air quality would continue into Saturday—though not at levels as bad as on Friday—and eventually clear out on Sunday and Monday.
Meanwhile, roughly 900 fires were actively burning in Canada as of Friday afternoon, according to the Canadian government’s national wildland fire summary, including 122 that were classified as “out of control”—meaning they are expected to continue to spread.
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