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Four Highest Eight-Hour Ozone Concentrations in 2018
as of April 22

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 2018 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 St104/06/201811004403/11/201810004404/12/201807004204/10/2018100042
Ogden Dunes104/19/201813005604/20/201809005004/12/201809004904/08/2018100049
Michigan City-W. Michigan Blvd104/19/201814005804/20/201809005504/21/201814005104/17/2018110050
Valparaiso104/19/201811005204/12/201809005104/20/201809004704/10/2018090047
Gary-IITRI104/19/201813005504/21/201816004904/20/201811004904/17/2018120049
LaPorte-E. Lincolnway104/19/201813005504/12/201809005204/20/201809005103/15/2018070050
North Central
South Bend-Shields Dr104/20/201811005104/19/201813005104/12/201810005104/21/2018110049
Bristol104/12/201811005204/21/201811005104/19/201813005104/20/2018110050
Potato Creek State Park104/12/201811005404/19/201810005304/20/201810005104/08/2018110051
Granger-Beckley St104/19/201813005204/12/201811005204/20/201810005104/21/2018110049
North East
Fort Wayne-Beacon St104/12/201811005404/19/201810005104/20/201811005004/13/2018090050
Leo HS104/12/201812005404/13/201810005204/19/201810005104/20/2018100050
Roanoke Elem. School104/19/201809005004/21/201810004904/20/201812004903/15/2018100044
West Central
Terre Haute-Lafayette Ave104/12/201812005804/21/201810005504/17/201811005303/25/2018120050
Flora104/20/201810005004/19/201810005004/21/201810004904/12/2018110048
Sandcut104/12/201812005904/21/201811005704/17/201812005404/19/2018110051
West Union104/12/201809005704/21/201809005604/17/201810005404/19/2018100051
East Central
Emporia104/12/201811005804/21/201810005204/13/201809005204/19/2018100051
Albany104/12/201811006004/13/201809005304/19/201810005103/15/2018110049
Indpls-Washington Park104/12/201810005404/21/201811005304/19/201811005004/20/2018100049
Indpls-Harding St104/12/201811005804/21/201811005704/20/201811005104/19/2018110050
Indpls-Ft. Harrison104/12/201811005804/21/201811005604/20/201811005304/19/2018110053
Monrovia104/12/201811005504/21/201810005204/19/201811004904/17/2018110049
Whitestown104/12/201811005604/21/201810005404/19/201811005104/20/2018100049
Avon104/12/201811005604/21/201811005204/20/201812004904/19/2018110049
Fairland104/12/201811005804/13/201808005104/19/201811005003/15/2018100049
Noblesville-191st St104/12/201811005704/21/201811005104/13/201808005104/19/2018110050
Hope104/12/201811005804/21/201809005504/17/201811005304/13/2018090053
Indpls - I-70 E104/12/201811005304/21/201810005004/13/201807004904/08/2018130046
Kokomo - E. Vaile Ave.104/12/201811005504/19/201810005003/15/201810005004/20/2018110049
Helmsburg104/21/201810005604/17/201811005404/19/201812005304/20/2018100052
South West
Boonville103/15/201811006304/21/201810005904/18/201810005504/17/2018100055
Evansville-Buena Vista Rd103/15/201810006104/21/201810005704/18/201810005504/12/2018100053
Inglefield103/15/201811006004/21/201810005804/12/201811005504/18/2018100054
St. Philips103/15/201811006404/21/201810005704/18/201810005704/12/2018110056
Leopold103/15/201812006404/21/201812006104/17/201811005704/12/2018110057
Dayville103/15/201811006004/21/201810005504/18/201810005304/17/2018100052
Plummer104/21/201811005604/12/201810005504/20/201811005204/17/2018120052
South East
New Albany104/21/201811005804/17/201812005504/12/201812005503/15/2018110054
Charlestown State Park104/21/201810005804/17/201811005704/13/201809005504/12/2018120055
Brownstown104/12/201810005504/21/201810005204/19/201813005104/17/2018120051
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.