IN.gov - Skip Navigation

Note: This message is displayed if (1) your browser is not standards-compliant or (2) you have you disabled CSS. Read our Policies for more information.

Air Quality Forecasting

Current estimated air quality index and forecasts by region

Forecast discussion

IDEM has issued an Air Quality Action Day and is forecasting high ozone levels on Monday, July 31, 2017 for the Lake, Porter, LaPorte, St. Joseph and Elkhart counties including the cities of Hammond, Gary, Portage, Valparaiso, Michigan City, LaPorte, South Bend, and Elkhart.

The Ozone (O3) forecast for Monday, July 31, 2017 is moderate for North East, Central and Southern Indiana.

The forecast for fine particulates (PM2.5) is good for July 31, 2017.

IDEM encourages everyone to help reduce ozone by making simple changes to their daily habits. You can:

Anyone sensitive to poor air quality may be affected when ozone levels are high. Children, the elderly and anyone with heart or lung conditions should reduce or avoid exertion and heavy work outdoors.

IDEM examines weather patterns and current ozone readings to make daily air quality forecasts. To learn more about ozone or sign up for air quality forecasts, visit www.SmogWatch.IN.gov.

Ground-level ozone is formed when sunlight and hot weather bake vehicle exhaust, factory emissions and gasoline vapors. Ozone in the upper atmosphere blocks ultraviolet radiation, but ozone near the ground is a lung irritant that can cause coughing and breathing difficulties.

Region Current conditions
as of August 21, 2017 2:08 am EDT
Forecast for August 21, 2017
Estimated Air Quality Index Primary
Pollutant
Forecast Primary
Pollutant
Bloomington Not available No Forecast
Louisville Good - 1 SO2 No Forecast
Leopold Not available No Forecast
Michigan City Not available No Forecast
Muncie Not available No Forecast
South Bend Good - 3 NO2 No Forecast
Terre Haute Good - ## SO2 No Forecast
Indianapolis-Carmel-Anderson Good - 12 NO2 No Forecast
Columbus Not available No Forecast
Elkhart-Goshen Not available No Forecast
Evansville-Henderson Not available No Forecast
Fort Wayne Not available No Forecast
Gary Not available No Forecast
Kokomo Not available No Forecast
Lafayette Not available 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.