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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
11:16 am EDT
North West
Michigan City-W. Michigan Blvd177827176
Ogden Dunes172716870
LaPorte-E. Lincolnway172716168
Hammond-141st St169 *626565
North Central
Granger-Beckley St168 *706166
Bristol164 *705864
Potato Creek State Park168 *696166
South Bend-Shields Dr172736570
North East
Leo HS164 *726366
Roanoke Elem. School161 *666062
Fort Wayne-Beacon St162696364
West Central
Flora161 *666162
Sandcut166 *686165
Terre Haute-Lafayette Ave168696366
West Union167 *666064
East Central
Indpls-Washington Park167726668
Fairland169 *726368
Trafalgar (Deactivated Nov 1, 2017)163 *   
Kokomo - E. Vaile Ave.1 7263 
Avon167 *675964
Indpls-E.16th St169 *   
Helmsburg162 *655962
Monrovia158 *666462
Emporia168 *726468
Indpls-Harding St164 *756568
Hope164 *696265
Indpls - I-70 E163706064
Albany163 *705964
Indpls-Ft. Harrison168 *766770
Whitestown166 *736668
Noblesville-191st St169 *716468
South West
Inglefield168 *666064
Boonville168 *706266
Leopold166 *636364
Evansville-Buena Vista Rd164686465
Lynnville (Deactivated Nov 1, 2017)164 *   
St. Philips168 *676165
Plummer167 *666265
Dayville168 *655964
South East
Brownstown163 *656062
Charlestown State Park168716467
New Albany174736370
* 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.