Conditions are expected to remain this way through Friday before improving this weekend.
site showed cities including Chicago, Detroit, Indianapolis and Cleveland, Ohio, had “very unhealthy air” as of Wednesday afternoon. A wider circle of unhealthy air spread into Pittsburgh, St. Louis and Louisville, Kentucky, according to an Associated Press story.
Another round of drifting smoke from the wildfires was moving through western Pennsylvania and western New York and headed toward the mid-Atlantic, said National Weather Service meteorologist Byran Jackson. In Canada, smoke will migrate across Quebec and Ontario over the next few days, Environment and Climate Change Canada meteorologist Steven Flisfeder said.
The U.S. Environmental Protection Agency’s Air Quality Index provides standardized color codes for forecasting and reporting daily air quality. Green signifies good air quality; Yellow means moderate air quality; Orange represents unhealthy pollution levels for sensitive groups of people; and Red warns of unhealthy pollution levels for all. An Air Quality Action Day is declared when the AQI is forecasted to be Code Orange or higher.
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