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Air Quality Forecasting

Current estimated air quality index and forecasts by region

Forecast discussion

Today temperatures are in the low 70’s this morning with clear skies and light southeast winds. Winds will increase today with a surface high pressure in Kentucky and an upper level high in the southeastern states. The upper level ridge will weaken due to tropical storm Nicholas in Texas. Today will be sunny but some clouds will build up tomorrow with a chance of evening showers. Most of the showers will occur overnight with a few remaining during the day Wednesday. After a cold front passage near midnight Wednesday temps will only reach the upper 70’s due to the slowly departing trough.

Northern Indiana

September 13-15, 2021: Ozone and PM2.5 forecast is Moderate

Central Indiana

September 13, 2021: PM2.5 is Moderate and Ozone forecast is Good
September 14-15, 2021: Ozone and PM2.5 forecast is Good

Southern Indiana

September 13, 2021: PM2.5 is Moderate and Ozone forecast is Good
September 14-15, 2021: Ozone and PM2.5 forecast is Good

Region Current conditions
as of September 26, 2021 8:10 pm EDT
Forecast for September 26, 2021
Estimated Air Quality Index Primary
Forecast Primary
Bloomington Good - 46 PM2.5 (Lcl) No Forecast
Louisville Good - 41 O3 No Forecast
Michigan City Good - 41 O3 No Forecast
South Bend Good - 40 O3 No Forecast
Terre Haute Moderate - 53 PM2.5 (Lcl) No Forecast
Indianapolis-Carmel-Anderson Good - 43 O3 No Forecast
Evansville-Henderson Good - 43 O3 No Forecast
Fort Wayne Good - 41 O3 No Forecast
Gary Good - 42 O3 No Forecast
Lafayette Good - 40 O3 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.