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Four Highest Eight-Hour Ozone Concentrations in 2020
as of April 4

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 2020 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 St104/03/202010004703/08/202010004303/20/202023004003/21/2020010039
Ogden Dunes104/03/202010004903/08/202011004503/21/202001004103/20/2020210041
Michigan City-W. Michigan Blvd104/03/202012005103/08/202009004402/19/202019004403/20/2020200043
Valparaiso103/08/202010004303/20/202020004103/17/202011004103/01/2020100041
Gary-IITRI104/03/202009005203/17/202011004403/08/202010004403/20/2020220041
LaPorte-E. Lincolnway104/03/202011005103/08/202010004203/23/202009004003/04/2020100040
North Central
South Bend-Shields Dr103/25/202013004003/23/202011003903/30/202010003702/07/2020100037
Bristol104/03/202012005003/08/202013004302/29/202010004002/28/2020090040
Potato Creek State Park104/03/202011005203/08/202012004803/25/202013004504/02/2020110043
Granger-Beckley St104/03/202012005303/08/202011004504/02/202012004103/17/2020120041
North East
Fort Wayne-Beacon St104/03/202011005003/08/202012004404/02/202011004303/01/2020120042
Leo HS104/03/202011004803/08/202012004401/20/202011004304/02/2020110042
Roanoke Elem. School101/01/2020210033No DataNo DataNo Data
West Central
Terre Haute-Lafayette Ave104/03/202013005003/01/202013004403/30/202011004303/29/2020110043
Flora104/03/202011004603/08/202011004203/02/202001004203/01/2020220042
Sandcut104/03/202012005203/08/202013004703/01/202013004704/02/2020100045
West Union104/03/202010005003/01/202012004603/29/202010004503/30/2020100044
East Central
Emporia104/03/202012004503/01/202021004503/29/202013004403/08/2020110043
Albany104/03/202011004703/01/202014004603/29/202013004403/08/2020100044
Indpls-Washington Park104/03/202011005003/08/202011004503/01/202020004403/30/2020100043
Indpls-Harding St104/03/202012005104/02/202012004403/08/202012004403/01/2020210044
Indpls-Ft. Harrison104/03/202011004903/08/202011004403/29/202012004303/30/2020100042
Monrovia101/09/202012003801/01/202013003601/10/202001003501/02/2020010034
Whitestown104/03/202012005203/08/202011004603/01/202012004603/30/2020110043
Avon104/03/202012005003/08/202014004603/01/202012004503/29/2020150044
Fairland104/03/202011004603/29/202013004403/30/202010004203/25/2020130042
Noblesville-191st St104/03/202012004803/08/202011004603/01/202021004503/29/2020130044
Hope104/03/202011005003/01/202015004803/25/202013004603/08/2020110046
Indpls - I-70 E104/03/202011004603/08/202013004603/01/202020004203/09/2020110040
Kokomo - E. Vaile Ave.104/03/202009004503/08/202012004503/29/202012004203/01/2020200042
Helmsburg104/03/202011005403/01/202015005203/08/202012005003/30/2020110047
South West
Boonville104/03/202009005303/01/202013004603/26/202011004403/08/2020120044
Evansville-Buena Vista Rd104/03/202010005303/08/202011004803/26/202012004703/01/2020110047
Inglefield104/03/202010005203/08/202011004703/01/202011004603/26/2020120045
St. Philips104/03/202010005403/26/202012004804/02/202011004503/30/2020090045
Leopold104/03/202011005603/01/202012005403/08/202012004903/26/2020130048
Dayville104/03/202010005403/26/202012004604/02/202011004403/30/2020090044
Plummer104/03/202010005203/08/202011004603/01/202013004603/30/2020100045
South East
New Albany104/03/202011005203/01/202015005103/30/202011004703/26/2020150047
Charlestown State Park104/03/202013005703/01/202013005103/30/202011004603/08/2020120046
Brownstown101/01/2020110034No DataNo DataNo Data
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.