Agency Links
IN.gov Links
Gov. Eric J. Holcomb
Eric J. Holcomb
Eric J. Holcomb
Visit His Homepage

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
1:08 pm EDT
North West
Michigan City-W. Michigan Blvd1 7774 
Ogden Dunes170 *727171
Gary-IITRI170 *706167
LaPorte-E. Lincolnway168 *727170
Hammond-141st St168 *69 *6065
North Central
Granger-Beckley St17168 *7069
Bristol17264 *6968
Potato Creek State Park169 *68 *6968
South Bend-Shields Dr172727272
North East
Leo HS166 *64 *7167
Roanoke Elem. School166 *61 *6664
Fort Wayne-Beacon St169 *626966
West Central
Flora166 *61 *6463
Sandcut167 *66 *6365
Terre Haute-Lafayette Ave169 *686567
West Union166 *67 *6566
East Central
Indpls-Washington Park170677169
Fairland165 *69 *7168
Trafalgar (Deactivated Nov 1, 2017)162 *63 *  
Kokomo - E. Vaile Ave.1  72 
Avon168 *67 *6466
Indpls-E.16th St168 *69 *  
Helmsburg163 *62 *6463
Monrovia165 *58 *6663
Emporia164 *68 *7268
Indpls-Harding St169 *64 *7469
Hope17164 *6867
Indpls - I-70 E168636966
Albany167 *63 *7066
Indpls-Ft. Harrison17368 *7672
Whitestown170 *66 *7369
Noblesville-191st St169 *69 *7169
South West
Inglefield170 *68 *6467
Boonville170 *68 *6768
Leopold169 *66 *6366
Evansville-Buena Vista Rd172646667
Lynnville (Deactivated Nov 1, 2017)17264 *  
St. Philips168 *68 *6667
Plummer169 *67 *6667
Dayville17168 *6568
South East
Brownstown170 *63 *6566
Charlestown State Park172686668
New Albany173746972
* 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.