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Air Quality Forecasting

Current estimated air quality index and forecasts by region

Forecast discussion

Temperatures are in the low teens in the east with fog and clouds and clear skies west with subzero readings in west central Indiana. Skies will clear out today with a surface high pressure building from the southwest. Tomorrow morning high pressure will build over the Mississippi and Ohio Valleys bringing temperatures back up to near freezing. By Sunday, a strengthening low will approach from the plains add to the warming trend and bring us a chance of rain or snow or frozen precip Sunday night into early Monday morning. Winds for Sunday and Monday will be over 10 MPH and gusting over 20.

February 19-22, 2021: PM2.5 forecast is Moderate and Ozone forecast is Good.

Region Current conditions
as of February 26, 2021 7:07 pm EST
Forecast for February 26, 2021
Estimated Air Quality Index Primary
Forecast Primary
Bloomington Good - 35 PM2.5 (Lcl) No Forecast
Louisville Good - 35 O3 No Forecast
Michigan City Good - 39 O3 No Forecast
South Bend Moderate - 63 PM2.5 (Lcl) No Forecast
Terre Haute Good - 39 PM2.5 (Lcl) No Forecast
Indianapolis-Carmel-Anderson Moderate - 70 PM2.5 (Lcl) No Forecast
Evansville-Henderson Good - 31 O3 No Forecast
Fort Wayne Moderate - 60 PM2.5 (Lcl) No Forecast
Gary Moderate - 59 PM2.5 (Lcl) No Forecast
Lafayette Moderate - 59 PM2.5 (Lcl) No Forecast

Air Quality Index

About Air Quality

IDEM monitors level of ozone and particle pollution from stations around Indiana. Both of these are pollutants that, at high levels, may raise health concerns in some people.

Ground-level ozone is the main ingredient in smog. It is a colorless gas formed by the reaction of sunlight with vehicle emissions, gasoline fumes, solvent vapors, and power plant and industrial emissions. Ozone formation is most likely in hot, dry weather when the air is fairly still.

Particle pollution monitoring is now available on the web for select areas in Indiana. Particle pollution is made up of particles found in soot, dust, smoke, and fumes. The burning of coal, oil, diesel, and other fuels produces these particles. The particles are small enough to enter deep into the lungs and cause health problems.

Ozone and particle pollution have been linked to short-term health concerns, particularly among children, asthmatics, people with heart or lung disease, and older adults. The effects of these pollutants can be minimized by avoiding strenuous activity or exercise when levels are high. You can use the forecast for the following day to plan your activities during the summer months. More information on the health effects of air pollutants is available from AirNow.

What Can I Do?

PLEASE NOTE: This data has not been verified by the IDEM and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from IDEM ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.