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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
Three-Year
Average
201920202021
as of
3:07 pm EDT
5/8/2021
North West
Michigan City-W. Michigan Blvd171795568
Ogden Dunes168765365
Gary-IITRI165745263
Valparaiso171675263
LaPorte-E. Lincolnway161645259
Hammond-141st St165715463
North Central
Granger-Beckley St161665761
Bristol158625257
Potato Creek State Park161675360
South Bend-Shields Dr165655260
North East
Leo HS163655360
Roanoke Elem. School (Deactivated Jan 1, 2020)160   
Fort Wayne-Beacon St163635259
West Central
Flora161625760
Sandcut161625659
Terre Haute-Lafayette Ave163645259
West Union160605658
East Central
Indpls-Washington Park166635260
Fairland163615158
Anderson-Eastside Elem. School2  57 
Kokomo - E. Vaile Ave.163645661
Avon159635458
Helmsburg159625859
Monrovia (Deactivated Jan 1, 2020)164   
Emporia (Deactivated Dec 4, 2020)16459  
Indpls-Harding St165675261
Hope162655661
Indpls - I-70 E160595056
Albany159625558
Indpls-Ft. Harrison167625661
Whitestown166695162
Noblesville-191st St164635661
South West
Inglefield160645559
Boonville162655059
Leopold163655761
Evansville-Buena Vista Rd164675261
St. Philips161645058
Dayville159665359
Plummer162645660
South East
Brownstown (Deactivated Jan 1, 2020)160   
Charlestown State Park164625560
New Albany163665461

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.