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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, 2020, 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
as of
9:10 pm EDT
North West
Michigan City-W. Michigan Blvd17972  ** 
Ogden Dunes17672  ** 
Gary-IITRI17470  ** 
Valparaiso16766  ** 
LaPorte-E. Lincolnway16464  ** 
Hammond-141st St17168  ** 
North Central
Granger-Beckley St16666  ** 
Bristol16263  ** 
Potato Creek State Park16762  ** 
South Bend-Shields Dr16566  ** 
North East
Leo HS16565  ** 
Fort Wayne-Beacon St (Deactivated Sep 30, 2021)16359 *  
West Central
Flora16266  ** 
Sandcut16261  ** 
Terre Haute-Lafayette Ave16463  ** 
West Union16062  ** 
East Central
Indpls-Washington Park16365  ** 
Fairland16165  ** 
Anderson-Eastside Elem. School2 65  ** 
Kokomo - E. Vaile Ave.16464  ** 
Avon16361  ** 
Helmsburg16262  ** 
Emporia (Deactivated Dec 4, 2020)159   
Indpls-Harding St16767  ** 
Hope16563  ** 
Indpls - I-70 E15960  ** 
Albany16264  ** 
Indpls-Ft. Harrison16266  ** 
Whitestown16965  ** 
Noblesville-191st St16365  ** 
South West
Inglefield16464  ** 
Boonville16566  ** 
Leopold16564  ** 
Evansville-Buena Vista Rd16764  ** 
St. Philips16459  ** 
Dayville16664  ** 
Plummer16466  ** 
South East
Charlestown State Park16263  ** 
New Albany16664  ** 
* The value shown for this site does not represent an entire year's worth of data (274 days of valid data).
** The value shown for this site does not represent a complete set of data for 2022 (14 days of valid data).

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.