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Compliance with Eight-Hour Ozone Standard

In July 1997, the U. S. Environmental Protection Agency (EPA) announced a new National Ambient Air Quality Standard (NAAQS) for ground-level ozone. The EPA phased out and replaced the previous one-hour standard with an eight-hour standard to protect public health against longer exposure to this air pollutant. In March 2008, the EPA updated the eight-hour standard again. A community will meet the eight-hour standard when the three-year average of the annual fourth highest daily maximum eight-hour ozone concentration measured at each monitoring site is less than 71 parts per billion (ppb).

Highlighted rows show the monitor in each area that may ultimately be used to determine the area's compliance with the ozone standard. These highlighted monitors have measured an area's ozone concentrations over the past three years.

Below are the annual fourth highest daily maximum eight-hour average ozone concentrations from data collected beginning January 1, 2019, to date. Data is updated each hour. Data is given for each area that has ozone monitors.

Use the selection boxes below to customize this report. If you want to cut and paste data from this page into another application, such as a spreadsheet, select the comma-delimited format. Click on the Generate Report button once you have made your selections.

YearReport Format
AreaMonitoring SitePOCFourth Highest AverageCurrent
Three-Year
Average
201920202021
as of
8:10 pm EST
9/26/2021
North West
Michigan City-W. Michigan Blvd171797173
Ogden Dunes168767272
Gary-IITRI165747069
Valparaiso171676668
LaPorte-E. Lincolnway161646463
Hammond-141st St165716868
North Central
Granger-Beckley St161666664
Bristol158626361
Potato Creek State Park161676263
South Bend-Shields Dr165656665
North East
Leo HS163656564
Roanoke Elem. School (Deactivated Jan 1, 2020)160   
Fort Wayne-Beacon St163635961
West Central
Flora161626663
Sandcut161626161
Terre Haute-Lafayette Ave163646263
West Union160606260
East Central
Indpls-Washington Park166636564
Fairland163616262
Anderson-Eastside Elem. School2  65 
Kokomo - E. Vaile Ave.163646463
Avon159636161
Helmsburg159626261
Monrovia (Deactivated Jan 1, 2020)164   
Emporia (Deactivated Dec 4, 2020)16459  
Indpls-Harding St165676365
Hope162656363
Indpls - I-70 E160596059
Albany159626461
Indpls-Ft. Harrison167626665
Whitestown166696366
Noblesville-191st St164636564
South West
Inglefield160646462
Boonville162656664
Leopold163656464
Evansville-Buena Vista Rd164676465
St. Philips161645961
Dayville159666463
Plummer162646664
South East
Brownstown (Deactivated Jan 1, 2020)160   
Charlestown State Park164626363
New Albany163666464

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.