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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, 2015, 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
5:13 pm EDT
North West
Michigan City-W. Michigan Blvd167 * 77 
Ogden Dunes166 *70 *7269
Gary-IITRI164 *70 *7068
Valparaiso160 *717769
LaPorte-E. Lincolnway161 *68 *7267
Hammond-141st St160 *68 *6965
North Central
Granger-Beckley St164 *716867
Bristol158 *726464
Potato Creek State Park158 *69 *6865
South Bend-Shields Dr166 *727270
North East
Leo HS162 *66 *6464
Roanoke Elem. School154 *66 *6160
Fort Wayne-Beacon St159 *69 *6263
West Central
Flora164 *66 *61 **63
Sandcut162 *67 *6665
Terre Haute-Lafayette Ave164 *69 *6867
West Union164 *66 *6765
East Central
Indpls-Washington Park167706768
Fairland159 *65 *6964
Trafalgar163 *62 *6362
Avon155 *68 *6763
Indpls-E.16th St162 *68 *6966
Helmsburg162 *63 *6262
Monrovia163 *65 *5862
Emporia154 *64 *6862
Indpls-Harding St161 *69 *6464
Hope166 *7164 **67
Fortville (Deactivated Oct 1, 2015)162 *   
Indpls - I-70 E164686365
Albany158 *67 *6362
Indpls-Ft. Harrison169 *736870
Whitestown164 *70 *6666
Noblesville-191st St163 *69 *6967
South West
Inglefield168 *70 *6868
Boonville169 *70 *6869
Leopold167 *69 *6667
Evansville-Buena Vista Rd172726469
Lynnville162 *726466
St. Philips167 *68 *6867
Plummer167 *69 *6767
Dayville165 *716868
South East
Brownstown164 *70 *63 **65
Charlestown State Park174726871
New Albany167 *737471
* 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 2017 (221 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.