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Four Highest Eight-Hour Ozone Concentrations in 2019
as of August 23

Use this form to retrieve the four highest eight-hour ozone concentration averages from data collected at IDEM monitoring sites beginning December 14, 2005 through today. Although this is our most current data, it is not considered official until it has been certified by our technical staff. This information is updated hourly. All times shown are in Local Standard Time.

The table below lists the four highest daily maximum eight-hour ozone concentrations measured in 2019 in each community where the IDEM measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) The fourth-highest average is in bold black (unless it is highlighted). All ozone measurements are in parts per billion. Times are shown in 24-hour format and correspond to the beginning of the eight hour average.

Use the selection boxes below to customize this report. You may select a different year or a different report format. If you want to cut and paste data from this web 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
Highlight with AQI colors
Area Monitoring Site POC Highest Second Highest Third Highest Fourth Highest
Date Time Value Date Time Value Date Time Value Date Time Value
North West
Hammond-141st St107/09/201910006707/01/201911006606/05/201910006608/03/2019110065
Ogden Dunes106/05/201911007406/29/201910006907/13/201912006807/01/2019110068
Michigan City-W. Michigan Blvd107/10/201910007808/05/201910007507/13/201911007406/05/2019110071
Valparaiso106/29/201910007507/03/201912007406/05/201911007407/01/2019110071
Gary-IITRI106/05/201912007108/03/201910006706/29/201911006708/10/2019110065
LaPorte-E. Lincolnway106/05/201911007008/03/201910006306/29/201910006208/04/2019080061
North Central
South Bend-Shields Dr107/09/201912006907/13/201911006806/05/201912006606/07/2019120063
Bristol106/05/201912006206/26/201911005907/26/201912005805/15/2019120058
Potato Creek State Park106/05/201912007006/07/201911006208/04/201909006106/29/2019110061
Granger-Beckley St107/09/201912006606/05/201912006606/07/201913006105/15/2019120061
North East
Fort Wayne-Beacon St107/09/201913006506/29/201913006407/01/201912006306/27/2019110063
Leo HS106/04/201914006907/09/201912006606/05/201914006307/13/2019110062
Roanoke Elem. School106/04/201913006507/09/201912006007/01/201914006006/29/2019130060
West Central
Terre Haute-Lafayette Ave106/06/201913006808/03/201911006307/26/201910006307/13/2019120063
Flora107/09/201911006506/27/201911006106/06/201910006105/31/2019110060
Sandcut106/06/201913006704/22/201912006206/07/201911006106/04/2019120061
West Union108/04/201910006008/03/201910006005/08/201911006007/09/2019100059
East Central
Emporia107/14/201911007107/13/201911006906/04/201911006408/05/2019100063
Albany107/13/201910006107/10/201911006007/27/201911005906/04/2019120059
Indpls-Washington Park108/01/201912007407/14/201910007008/04/201910006808/03/2019100064
Indpls-Harding St108/04/201910006706/06/201912006608/03/201910006508/01/2019120065
Indpls-Ft. Harrison107/14/201910007308/01/201911007007/13/201910006706/27/2019110067
Monrovia106/06/201911006608/03/201911006508/04/201910006408/02/2019100064
Whitestown108/03/201910006707/09/201911006606/06/201910006508/01/2019110064
Avon106/06/201912006808/03/201911006707/14/201910006008/04/2019100059
Fairland107/14/201911006507/13/201911006406/04/201911006308/05/2019090061
Noblesville-191st St106/27/201912007208/03/201910006508/04/201911006407/09/2019120064
Hope106/04/201911006308/05/201910006208/04/201911006206/06/2019110062
Indpls - I-70 E108/01/201912006707/14/201909006308/04/201909006008/03/2019100058
Kokomo - E. Vaile Ave.107/09/201912007307/26/201910006406/27/201911006308/03/2019100062
Helmsburg108/04/201910006205/08/201912006004/17/201915005904/16/2019120059
South West
Boonville107/13/201909006808/05/201910006308/11/201909006206/01/2019100061
Evansville-Buena Vista Rd107/13/201910006708/05/201909006508/11/201910006406/06/2019090064
Inglefield107/13/201909006508/11/201909006007/09/201910006006/27/2019100058
St. Philips106/06/201909006407/13/201909006307/25/201911006108/02/2019100060
Leopold106/29/201911006406/01/201910006405/17/201910006308/08/2019100061
Dayville107/13/201909006708/05/201910006307/09/201910006007/12/2019100059
Plummer107/13/201911006608/11/201910006308/05/201910006306/28/2019120062
South East
New Albany108/11/201911006608/05/201910006308/04/201911006308/02/2019120062
Charlestown State Park106/28/201911007107/13/201910006805/06/201911006608/05/2019100062
Brownstown108/04/201911006407/13/201911006006/29/201911006008/03/2019110058
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.

Interpreting the AQI

Air Quality Index

Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA's AirNow web site.

Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.

The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.

AQI Breakpoint Definitions
AQI Range 1hr Ozone
in ppm
8hr Ozone
in ppm
0 - 50 Not Defined 0 - 0.054
51 - 100 Not Defined 0.055 - 0.070
101 - 150 0.125 - 0.164 0.071 - 0.085
151 - 200 0.165 - 0.204 0.086 - 0.105
201 - 300 0.205 - 0.404 0.106 - 0.200
301 - 400 0.405 - 0.504 0.201 - 0.2011
401 - 500 0.505 - 0.604 Not Defined
500+ Not Defined Not Defined

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.