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
2:07 pm EST
North West
Michigan City-W. Michigan Blvd1 7735 
Ogden Dunes170 *723358
Gary-IITRI170 *702956
LaPorte-E. Lincolnway168 *723558
Hammond-141st St168 *69 *2654
North Central
Granger-Beckley St17168 *3558
Bristol17264 *3557
Potato Creek State Park169 *68 *32 **56
South Bend-Shields Dr172723359
North East
Leo HS166 *64 *3454
Roanoke Elem. School166 *61 *3554
Fort Wayne-Beacon St169 *623455
West Central
Flora166 *61 *3253
Sandcut167 *66 *3355
Terre Haute-Lafayette Ave169 *683256
West Union166 *67 *3355
East Central
Indpls-Washington Park170672955
Fairland165 *69 *3355
Trafalgar (Deactivated Nov 1, 2017)162 *63 *  
Kokomo - E. Vaile Ave.1  32 
Avon168 *67 *3356
Indpls-E.16th St168 *69 *  
Helmsburg163 *62 *3553
Monrovia165 *58 *3251
Emporia164 *68 *27 **53
Indpls-Harding St169 *64 *3455
Hope17164 *3556
Indpls - I-70 E168632853
Albany167 *63 *3254
Indpls-Ft. Harrison17368 *3458
Whitestown170 *66 *3356
Noblesville-191st St169 *69 *3156
South West
Inglefield170 *68 *3156
Boonville170 *68 *3357
Leopold169 *66 *3757
Evansville-Buena Vista Rd172643155
Lynnville (Deactivated Nov 1, 2017)17264 *  
St. Philips168 *68 *3657
Plummer169 *67 *3657
Dayville17168 *3357
South East
Brownstown170 *63 *3556
Charlestown State Park172683458
New Albany173743560
* 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 2018 (15 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.