Tuesday’s air quality warning has dropped to a 5, considered a moderate risk, down from Monday’s peak of 10+ on the Air Quality Health Index’s 10-point scale.

Air quality in the Chicago area remains poor for the third straight day in a row, with an air quality alert in effect through Wednesday night, along with extremely muggy conditions and the chance for ...

Official data showed Consumer Prices Index inflation rose to 3.6% in June, up from 3.4% in May and the highest since January ...

Wildfires are becoming more common in Canada and that means more smoke and air quality warnings. Here’s what you need to know about air quality to better understand how it could impact your health and ...

The Indiana Department of Environmental Management said Northwest Indiana’s ozone levels are expected to be unhealthy for ...

This week in the Boston Globe Weather Mailbag, Globe Weather HQ tackles questions surrounding summer thunderstorm frequency, ...

COLUMBUS, Ohio — Columbus is under an Air Quality Alert Tuesday due to elevated ozone levels. Mid-Ohio Regional Planning ...

The EPA's Air Quality Index can tell you whether breathing outside air can be harmful. Here's how to read the scale to plan ...

Here’s what led to the rise in Canada’s inflation number and what it could mean for the next Bank of Canada interest rate announcement.

The Air Quality Index (AQI) is a national system developed by the U.S. Environmental Protection Agency (EPA) to translate various air pollutant concentrations into a single, easy-to-understand number.