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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, 2017, 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
201720182019
as of
4:09 pm EDT
4/18/2019
North West
Michigan City-W. Michigan Blvd177825170
Ogden Dunes172715265
Gary-IITRI1707148 **63
Valparaiso177715066
LaPorte-E. Lincolnway172714964
Hammond-141st St169 *624759
North Central
Granger-Beckley St168 *704962
Bristol164 *704760
Potato Creek State Park168 *695463
South Bend-Shields Dr172734964
North East
Leo HS164 *725262
Roanoke Elem. School161 *664557
Fort Wayne-Beacon St162695060
West Central
Flora161 *665360
Sandcut166 *685161
Terre Haute-Lafayette Ave168695162
West Union167 *665161
East Central
Indpls-Washington Park167725163
Fairland169 *725264
Trafalgar (Deactivated Nov 1, 2017)163 *   
Kokomo - E. Vaile Ave.1 7253 
Avon167 *674961
Indpls-E.16th St169 *   
Helmsburg162 *655560
Monrovia158 *665359
Emporia168 *725264
Indpls-Harding St164 *7550 **63
Hope164 *695462
Indpls - I-70 E163704860
Albany163 *704860
Indpls-Ft. Harrison168 *764864
Whitestown166 *735063
Noblesville-191st St169 *715264
South West
Inglefield168 *665262
Boonville168 *705464
Leopold166 *635661
Evansville-Buena Vista Rd164685361
Lynnville (Deactivated Nov 1, 2017)164 *   
St. Philips168 *675563
Plummer167 *665261
Dayville168 *655362
South East
Brownstown163 *655260
Charlestown State Park168715665
New Albany174735366
* 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 2019 (80 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.