The Air Quality Index displayed on AirNow.gov ... The National Weather Service says that the Environmental Protection Agency calculates the Air Quality Index — a value between 0 and 500 ...

Knowing how to read the EPA's Air Quality Index can help you understand whether smoke from numerous Canadian wildfires makes it hazardous to breathe outside air. "The AQI is an index for reporting ...

The Air Quality Index reflects the density of five pollutants in the air: ground-level ozone, particulates, ... The index’s scale runs from 0 to 500; the higher the number, ...

The Air Quality Index ... to 500 (very high), making it easier for people to understand air quality conditions and their associated health risks, she said. For example, ...

Columbus' air quality is once again expected to become unhealthy for sensitive groups on June 12 due to smoke and ozone ...

The state Departments of Environmental Conservation and Health issued a ground-level ozone warning Thursday for the lower ...

Once the smoke rises high enough into the atmosphere, strong winds can carry it across regions, allowing smoke from Canadian fires to settle over Wisconsin.

Although the majority of wildfires are occurring in western Canada, smoke from these fires has been drifting eastward, impacting air quality in areas around the Great Lakes and the U.S. northeast, ...

AirNow said its air quality index determines the level of air pollution and the correlating health concerns. ... The scale goes from 0 to 500, with 500 being the worst.