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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
10:10 am EDT
6/12/2021
North West
Michigan City-W. Michigan Blvd171797073
Ogden Dunes168766670
Gary-IITRI165746467
Valparaiso171676367
LaPorte-E. Lincolnway161645861
Hammond-141st St165716065
North Central
Granger-Beckley St161666463
Bristol158625759
Potato Creek State Park161676062
South Bend-Shields Dr165656264
North East
Leo HS163656163
Roanoke Elem. School (Deactivated Jan 1, 2020)160   
Fort Wayne-Beacon St163635460
West Central
Flora161626161
Sandcut161625860
Terre Haute-Lafayette Ave163645761
West Union160605759
East Central
Indpls-Washington Park166635862
Fairland163615559
Anderson-Eastside Elem. School2  63 
Kokomo - E. Vaile Ave.163646162
Avon159635759
Helmsburg159626060
Monrovia (Deactivated Jan 1, 2020)164   
Emporia (Deactivated Dec 4, 2020)16459  
Indpls-Harding St165675562
Hope162656062
Indpls - I-70 E160595457
Albany159626060
Indpls-Ft. Harrison167626263
Whitestown166695964
Noblesville-191st St164636162
South West
Inglefield160645860
Boonville162655761
Leopold163656163
Evansville-Buena Vista Rd164675562
St. Philips161645359
Dayville159665961
Plummer162646162
South East
Brownstown (Deactivated Jan 1, 2020)160   
Charlestown State Park164625961
New Albany163665962

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.