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Air Quality Forecasting

Current estimated air quality index and forecasts by region

Forecast discussion

An Air Quality Action Day for Ozone is being issued on July 6 and 7, 2020 for the Northwest, North Central, and Northeast regions of Indiana.

An Air Quality Action Day means that meteorological conditions are favorable for ozone formation that could exceed the 2015 National Ambient Air Quality Standard for Ozone of 70 parts per billion averaged over 8 hours. Ozone is expected to reach the Unhealthy for Sensitive Groups/Orange category on the Air Quality Index Scale. People who are in this group are urged to take action and limit their exposure to outdoor air pollution on Air Quality Action Days.

July 6-7, 2020: Unhealthy for Sensitive Groups Northwest, North Central, and Northeast Indiana and Moderate in all other areas for Ozone. Moderate for PM2.5.

Region Current conditions
as of July 9, 2020 8:11 pm EDT
Forecast for July 9, 2020
Estimated Air Quality Index Primary
Forecast Primary
Bloomington Good - 45 PM2.5 (Lcl) No Forecast
Louisville Moderate - 67 O3 No Forecast
Michigan City Moderate - 90 O3 No Forecast
South Bend Moderate - 64 O3 No Forecast
Terre Haute Moderate - 64 O3 No Forecast
Indianapolis-Carmel-Anderson Moderate - 77 O3 No Forecast
Evansville-Henderson Good - 47 O3 No Forecast
Fort Wayne Moderate - 77 O3 No Forecast
Gary Moderate - 67 O3 No Forecast
Lafayette Good - 50 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.