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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, 2018, 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
201820192020
as of
5:09 am EDT
9/23/2020
North West
Michigan City-W. Michigan Blvd182717977
Ogden Dunes171687671
Gary-IITRI171657470
Valparaiso171716769
LaPorte-E. Lincolnway171616465
Hammond-141st St162657166
North Central
Granger-Beckley St170616665
Bristol170586263
Potato Creek State Park169616765
South Bend-Shields Dr173656567
North East
Leo HS172636566
Roanoke Elem. School (Deactivated Jan 1, 2020)16660  
Fort Wayne-Beacon St169636365
West Central
Flora166616263
Sandcut168616263
Terre Haute-Lafayette Ave169636465
West Union166606062
East Central
Indpls-Washington Park172666367
Fairland172636165
Kokomo - E. Vaile Ave.172636466
Avon167596363
Helmsburg165596262
Monrovia (Deactivated Jan 1, 2020)16664  
Emporia172645965
Indpls-Harding St175656769
Hope169626565
Indpls - I-70 E170605963
Albany170596263
Indpls-Ft. Harrison176676268
Whitestown173666969
Noblesville-191st St171646366
South West
Inglefield166606463
Boonville170626565
Leopold163636563
Evansville-Buena Vista Rd168646766
St. Philips167616464
Dayville165596663
Plummer166626464
South East
Brownstown (Deactivated Jan 1, 2020)16560  
Charlestown State Park171646265
New Albany173636667

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.