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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
6:08 pm EDT
1/21/2020
North West
Michigan City-W. Michigan Blvd182713663
Ogden Dunes171683156
Gary-IITRI171653155
Valparaiso171712957
LaPorte-E. Lincolnway171613154
Hammond-141st St162652952
North Central
Granger-Beckley St170613154
Bristol170583253
Potato Creek State Park169613254
South Bend-Shields Dr173653256
North East
Leo HS172633556
Roanoke Elem. School (Deactivated Jan 1, 2020)16660  ** 
Fort Wayne-Beacon St169633254
West Central
Flora166613052
Sandcut168613253
Terre Haute-Lafayette Ave169632853
West Union166603152
East Central
Indpls-Washington Park172663357
Fairland172633356
Kokomo - E. Vaile Ave.172633155
Avon167593152
Helmsburg165593452
Monrovia (Deactivated Jan 1, 2020)166643454
Emporia172643356
Indpls-Harding St175652956
Hope169623555
Indpls - I-70 E170602752
Albany170593354
Indpls-Ft. Harrison176673158
Whitestown173663056
Noblesville-191st St171643155
South West
Inglefield166603252
Boonville170623254
Leopold163633854
Evansville-Buena Vista Rd168643355
St. Philips167613153
Dayville165593252
Plummer166623253
South East
Brownstown (Deactivated Jan 1, 2020)16560  ** 
Charlestown State Park171643456
New Albany173633256
** The value shown for this site does not represent a complete set of data for 2020 (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.