Additional Air Quality Action Days for Northwest, Northern Indiana Due to Smoke from Western Wildfires

Air Quality Action Days have been issued for today (Friday) and Saturday in Northwest and North Central Indiana due to smoke from the wildfires out west. Two other air quality action days that were statewide were issued for the same reason earlier this week. The Indiana Department of Environmental Management (IDEM) is forecasting high levels of fine particles in the air – known as PM2.5 – due to smoke produced by wildfires in the western United States and southern Canada. IDEM says fine particulate matter is known as PM2.5 because it refers to microscopic dust, soot, liquid droplets and smoke particles that are 2.5 micrometers wide or smaller. To put that into perspective, the Environmental Protection Agency (EPA) says the average human hair is about 70 micrometers in diameter, or about thirty times larger than the largest fine particle.

Additional information from IDEM:

IDEM encourages everyone to help reduce PM2.5 while remaining safe during the COVID-19 health crisis by making changes to daily habits. You can:
• Reduce activity time outdoors to reduce unhealthy exposure to PM2.5 and avoid exercising near busy roads.
• Avoid burning wood and any other unnecessary fires.
o Reminder: Indiana’s open burning laws make it illegal to burn trash and generally prohibit open burning, visit for more information.
• Combine errands into one trip.
• Avoid using gasoline-powered equipment or gas-powered recreational vehicles.
• Keep your engine tuned, and don’t let your engine idle (e.g., at a bank or restaurant drive-thru).
• Conserve energy by turning off lights or setting the thermostat to 75 degrees or higher.
Air Quality Action Days are in effect from midnight to 11:59 p.m. on the specified date. Anyone sensitive to changes in air quality may be affected when PM2.5 levels are high. Children, the elderly, and anyone with heart or lung conditions should reduce or avoid exertion and heavy work outdoors. Those people at risk are particularly vulnerable after several days of high PM2.5 exposure. PM2.5 is composed of microscopic dust, soot, and liquid that settles deep into the lungs and cannot be easily exhaled.

IDEM examines weather patterns and PM2.5 readings to make daily air quality forecasts. Air Quality Action Days generally occur when weather conditions such as light winds, higher humidity, and lower atmospheric inversions trap pollutants close to the ground, or when winds transport smoke to the area. To learn more about PM2.5 or sign up for air quality alerts, visit .
To learn more about how smoke from fires can affect your health, visit .