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Air Quality Forecasting

Current estimated air quality index and forecasts by region

Forecast discussion

High pressure in the plains states approaches the state today. A low in Michigan will pass a cold front through early this evening so that Saturday will only reach into the low-60's. Saturday will start with dew points below freezing but as the high retreats during the day and the system in the Rockies begins to bring moisture northward a threat of nearly 2 inches of rain with thunderstorms for central Indiana from Saturday night into Sunday evening. By Monday morning the system will be near the Atlantic coast and high pressure will be over the northern Midwest. Monday will be clearing with highs down to the upper-50's.

May 7-10, 2021: PM2.5 and Ozone forecast is Good.

Forecasts updated May 7, 2021 9:15 am EDT.

Region Current conditions
as of May 8, 2021 4:08 pm EDT
Forecast for May 8, 2021 Forecast for May 9, 2021 Forecast for May 10, 2021
Estimated Air Quality Index Primary
Pollutant
Forecast Primary
Pollutant
Forecast Primary
Pollutant
Forecast Primary
Pollutant
Bloomington Good - 31 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)
Louisville Good - 34 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)
Michigan City Good - 32 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)
South Bend Good - 31 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)
Terre Haute Good - 31 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)
Indianapolis-Carmel-Anderson Good - 32 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)
Evansville-Henderson Good - 31 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)
Fort Wayne Good - 29 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)
Gary Good - 32 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)
Lafayette Good - 32 O3 Good PM2.5 (Lcl) Good PM2.5 (Lcl) Good PM2.5 (Lcl)

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.