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 accordingly in Michigan.

The New York State Department of Environmental Conservation and the State Department of Health have issued an Air Quality Health Advisory for Eastern Lake Ontario, Western New York, and other regions in New York.

This week in the Boston Globe Weather Mailbag, Globe Weather HQ tackles questions surrounding summer thunderstorm frequency, the best weather reporting station, air quality categories, and the HAARP model, most commonly used in Aurora forecasting.

Officials have issued an air quality alert for around 10 million Americans, telling them to minimize outdoor activities and shut all windows on Tuesday. A National Weather Service (NWS) map shows parts of Minnesota, Michigan, Illinois, New York ...