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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
as of
5:07 pm EDT
North West
Michigan City-W. Michigan Blvd177826073
Ogden Dunes172715967
LaPorte-E. Lincolnway172715967
Hammond-141st St169 *625562
North Central
Granger-Beckley St168 *705965
Bristol164 *705462
Potato Creek State Park168 *696065
South Bend-Shields Dr172735968
North East
Leo HS164 *726165
Roanoke Elem. School161 *665560
Fort Wayne-Beacon St162695762
West Central
Flora161 *665861
Sandcut166 *686165
Terre Haute-Lafayette Ave168696266
West Union167 *665763
East Central
Indpls-Washington Park167725765
Fairland169 *725766
Trafalgar (Deactivated Nov 1, 2017)163 *   
Kokomo - E. Vaile Ave.1 7258 
Avon167 *675663
Indpls-E.16th St169 *   
Helmsburg162 *655962
Monrovia158 *665860
Emporia168 *725765
Indpls-Harding St164 *7556 **65
Hope164 *695863
Indpls - I-70 E163705562
Albany163 *705362
Indpls-Ft. Harrison168 *765967
Whitestown166 *735966
Noblesville-191st St169 *715966
South West
Inglefield168 *665563
Boonville168 *705765
Leopold166 *635862
Evansville-Buena Vista Rd164685763
Lynnville (Deactivated Nov 1, 2017)164 *   
St. Philips168 *675764
Plummer167 *665964
Dayville168 *655663
South East
Brownstown163 *655561
Charlestown State Park168715765
New Albany174735768
* 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 (131 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.