The EPA breaks the Air Quality Index into a few categories with different recommendations. Green (0–50): The air is safe to ...

When air quality is ranked "unhealthy for vulnerable groups" it means PM 2.5 are at levels that can cause problems for people ...

The Southwest Ohio Air Quality Agency reports that "levels of ozone within the region may approach or exceed unhealthy ...

“Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of ...

The Department of Natural Resources and Environmental Control warns of air that is unsafe for sensitive groups on July 5.

Smoke from the Madre Fire in San Luis Obispo County could potentially bring poor air quality to the High Desert over the July ...

During the last pre-monsoon months, the air quality index (AQI) of Kathmandu was recorded to be alarmingly high with an ...

HUNTSVILLE, Ala. — Air quality in and around Huntsville improved early Saturday after spending several hours in the unhealthy ...

The National Weather Service has issued a heat advisory and air quality alert for the third day during the first heat wave of the year.