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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 am EST
North West
Michigan City-W. Michigan Blvd1 7750 
Ogden Dunes170 *724963
Gary-IITRI170 *704963
LaPorte-E. Lincolnway168 *725063
Hammond-141st St168 *69 *4259
North Central
Granger-Beckley St17168 *4962
Bristol17264 *5062
Potato Creek State Park169 *68 *5162
South Bend-Shields Dr172724964
North East
Leo HS166 *64 *5060
Roanoke Elem. School166 *61 *4457
Fort Wayne-Beacon St169 *625060
West Central
Flora166 *61 *4858
Sandcut167 *66 *5161
Terre Haute-Lafayette Ave169 *685062
West Union166 *67 *5161
East Central
Indpls-Washington Park170674962
Fairland165 *69 *4961
Trafalgar (Deactivated Nov 1, 2017)162 *63 *  
Kokomo - E. Vaile Ave.1  49 
Avon168 *67 *4961
Indpls-E.16th St168 *69 *  
Helmsburg163 *62 *5259
Monrovia165 *58 *4957
Emporia164 *68 *5161
Indpls-Harding St169 *64 *5061
Hope17164 *5362
Indpls - I-70 E168634659
Albany167 *63 *4959
Indpls-Ft. Harrison17368 *5364
Whitestown170 *66 *4961
Noblesville-191st St169 *69 *5062
South West
Inglefield170 *68 *5464
Boonville170 *68 *5564
Leopold169 *66 *5764
Evansville-Buena Vista Rd172645363
Lynnville (Deactivated Nov 1, 2017)17264 *  
St. Philips168 *68 *5664
Plummer169 *67 *5262
Dayville17168 *5263
South East
Brownstown170 *63 *5161
Charlestown State Park172685565
New Albany173745467
* 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.