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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, 2019, 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
7:07 pm EDT
North West
Michigan City-W. Michigan Blvd171794264
Ogden Dunes168764262
LaPorte-E. Lincolnway161644255
Hammond-141st St165714159
North Central
Granger-Beckley St161664055
Potato Creek State Park161674758
South Bend-Shields Dr165653956
North East
Leo HS163654256
Roanoke Elem. School (Deactivated Jan 1, 2020)160   
Fort Wayne-Beacon St163634557
West Central
Terre Haute-Lafayette Ave163644256
West Union160604755
East Central
Indpls-Washington Park166634357
Anderson-Eastside Elem. School2  48 
Kokomo - E. Vaile Ave.163645059
Monrovia (Deactivated Jan 1, 2020)164   
Emporia (Deactivated Dec 4, 2020)16459  
Indpls-Harding St165674057
Indpls - I-70 E160593451
Indpls-Ft. Harrison167624156
Noblesville-191st St164634557
South West
Inglefield1606430 **51
Evansville-Buena Vista Rd164673956
St. Philips161644356
South East
Brownstown (Deactivated Jan 1, 2020)160   
Charlestown State Park164624557
New Albany163664257
** The value shown for this site does not represent a complete set of data for 2021 (42 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.