IDEM forecasts Air Quality Action Day for Thursday in Northwest and North Central regions of Indiana

Thursday, July 31, 2025 at 11:21 AM

By Staff report

The Indiana Department of Environmental Management (IDEM) has forecast an Air Quality Action Day (AQAD) for July 31.

Fine particulate matter levels are expected to be in the Unhealthy for Sensitive Groups range (Orange) in the following areas:

North Central Indiana, including the cities of: Elkhart, Goshen, Knox, Logansport, Plymouth, Peru, South Bend, Warsaw, Winamac and all other cities within the area.
Northwest Indiana, including the cities of: Crown Point, Gary, Hammond, Kentland, LaPorte, Michigan City, Portage, Rensselaer, Valparaiso and all other cities within the area.

A shift to northeasterly winds this morning is driving Canadian wildfire smoke southward across the Great Lakes region. As a result, fine particulate monitor readings in Northwest and North Central Indiana are beginning to rise, with elevated levels expected to persist throughout the day.

IDEM forecasted Air Quality Action Days indicate anticipated higher levels of ground-level ozone and fine particulate matter only. Other factors may affect overall air quality.

Hoosiers can visit SmogWatch.IN.gov to:

View Air quality information for all Indiana counties, including a state map of affected counties;
Learn more about Air Quality Action Days and recommended actions;
Learn more about ozone and fine particulate matter; and
Sign up for air quality alerts.

Air Quality Action Days are in effect from midnight to 11:59 p.m. (24-hours) on the specified date. Some municipalities have additional open burning restrictions on AQADs. For more information, go to idem.IN.gov/openburning/laws-and-rules.

Note: IDEM forecasts are based, solely or in part, on data from air quality monitors located throughout the state. IDEM encourages residents of counties within or bordering the affected region(s) to heed the forecast. Air quality information for all Indiana counties can be found at SmogWatch.IN.gov.