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 ...

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, ...

The Air Quality Index measures particles in the air, ... The index ranges from 0 to 500 and uses a color coded system: A guide to AQI's numerical and color-based scale. (AirNow.Gov) ...

The state Departments of Environmental Conservation and Health issued a ground-level ozone warning Thursday for the lower Hudson Valley, New York City and Long Island. Health officials warned that ...

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

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, ...

The Mid-Ohio Regional Planning Commission (MORPC) has issued an Air Quality Alert for Saturday in the Columbus region due to elevated particle levels from Canadian wildfire smoke. Light northeasterly ...

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.