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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, 2016, 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
8:10 pm EDT
North West
Michigan City-W. Michigan Blvd1 7782 
Ogden Dunes170 *727171
Gary-IITRI170 *707170
LaPorte-E. Lincolnway168 *727170
Hammond-141st St168 *69 *6266
North Central
Granger-Beckley St17168 *7069
Bristol17264 *7068
Potato Creek State Park169 *68 *6968
South Bend-Shields Dr172727372
North East
Leo HS166 *64 *7267
Roanoke Elem. School166 *61 *6664
Fort Wayne-Beacon St169 *626966
West Central
Flora166 *61 *6664
Sandcut167 *66 *6867
Terre Haute-Lafayette Ave169 *686968
West Union166 *67 *6666
East Central
Indpls-Washington Park170677269
Fairland165 *69 *7268
Trafalgar (Deactivated Nov 1, 2017)162 *63 *  
Kokomo - E. Vaile Ave.1  72 
Avon168 *67 *6767
Indpls-E.16th St168 *69 *  
Helmsburg163 *62 *6563
Monrovia165 *58 *6663
Emporia164 *68 *7268
Indpls-Harding St169 *64 *7569
Hope17164 *6968
Indpls - I-70 E168637067
Albany167 *63 *7066
Indpls-Ft. Harrison17368 *7672
Whitestown170 *66 *7369
Noblesville-191st St169 *69 *7169
South West
Inglefield170 *68 *6668
Boonville170 *68 *7069
Leopold169 *66 *6366
Evansville-Buena Vista Rd172646868
Lynnville (Deactivated Nov 1, 2017)17264 *  
St. Philips168 *68 *6767
Plummer169 *67 *6667
Dayville17168 *6568
South East
Brownstown170 *63 *6566
Charlestown State Park172687170
New Albany173747373
* The value shown for this site does not represent an entire year's worth of data (274 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.