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Four Highest Eight-Hour Ozone Concentrations in 2022
as of January 20

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 2022 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 St101/01/202223003501/02/2022010032No DataNo Data
Ogden Dunes101/02/202201003701/01/2022230036No DataNo Data
Michigan City-W. Michigan Blvd101/02/202207003301/01/2022200032No DataNo Data
Valparaiso101/02/202208003401/01/2022230033No DataNo Data
Gary-IITRI101/02/202201003801/01/2022230038No DataNo Data
LaPorte-E. Lincolnway101/02/202208003401/01/2022210031No DataNo Data
North Central
South Bend-Shields Dr101/02/202210003601/01/2022220033No DataNo Data
Bristol101/02/202211003601/01/2022210033No DataNo Data
Potato Creek State Park101/02/202209003601/01/2022230032No DataNo Data
Granger-Beckley St101/02/202211003701/01/2022210033No DataNo Data
North East
Leo HS101/02/202210003401/01/2022220031No DataNo Data
West Central
Terre Haute-Lafayette Ave101/02/202207002901/01/2022230020No DataNo Data
Flora101/02/202211003401/01/2022230029No DataNo Data
Sandcut101/02/202211003401/01/2022230022No DataNo Data
West Union101/02/202204002801/01/2022230022No DataNo Data
East Central
Anderson-Eastside Elem. School201/02/202210003301/01/2022230027No DataNo Data
Albany101/02/202213003301/01/2022230027No DataNo Data
Indpls-Washington Park101/02/202213003201/01/2022230023No DataNo Data
Indpls-Harding St101/02/202214003201/01/2022230023No DataNo Data
Indpls-Ft. Harrison101/02/202213003301/01/2022230024No DataNo Data
Whitestown101/02/202214003501/01/2022230026No DataNo Data
Avon101/02/202215003401/01/2022230023No DataNo Data
Fairland101/02/202215003201/01/2022000024No DataNo Data
Noblesville-191st St101/02/202215003401/01/2022230025No DataNo Data
Hope101/02/202216003301/01/2022000026No DataNo Data
Indpls - I-70 E101/02/202212002901/01/2022230022No DataNo Data
Kokomo - E. Vaile Ave.101/02/202212003501/01/2022230028No DataNo Data
Helmsburg101/02/202216003201/01/2022000027No DataNo Data
South West
Boonville101/02/202218003401/01/2022000025No DataNo Data
Evansville-Buena Vista Rd101/02/202218002801/01/2022000020No DataNo Data
Inglefield101/02/202218003101/01/2022000025No DataNo Data
St. Philips101/02/202218002701/01/2022000022No DataNo Data
Leopold101/02/202221003401/01/2022100031No DataNo Data
Dayville101/02/202218003401/01/2022110026No DataNo Data
Plummer101/02/202216003501/01/2022000024No DataNo Data
South East
New Albany101/02/202219003201/01/2022000021No DataNo Data
Charlestown State Park101/02/202218003201/01/2022080026No 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.