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Daily Maximum Eight-Hour Ozone Averages for April 2020

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 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.) All ozone measurements are in parts per billion.

Use the selection boxes below to customize this report. You may select a different month, a different year, a different report format, and whether or not to include time on the report. Click on the Generate Report button once you have made your selections.

Month:Year:Report Format: Include time:
Include time
Highlight with AQI colors
AreaMonitoring SitePOCApril 2020
1234
North West
Hammond-141st St1262947NA
Ogden Dunes1303649NA
Michigan City-W. Michigan Blvd1303551NA
Gary-IITRI1303652NA
LaPorte-E. Lincolnway1283951NA
AreaMonitoring SitePOCApril 2020
1234
North Central
Bristol1243850NA
Potato Creek State Park1304352NA
Granger-Beckley St1284153NA
AreaMonitoring SitePOCApril 2020
1234
North East
Fort Wayne-Beacon St1234350NA
Leo HS1224248NA
AreaMonitoring SitePOCApril 2020
1234
West Central
Terre Haute-Lafayette Ave1284250NA
Flora1293946NA
Sandcut1334552NA
West Union1304150NA
AreaMonitoring SitePOCApril 2020
1234
East Central
Emporia1263945NA
Albany1243747NA
Indpls-Washington Park1294250NA
Indpls-Harding St1274451NA
Indpls-Ft. Harrison1274149NA
Whitestown1304152NA
Avon1294150NA
Fairland1254046NA
Noblesville-191st St1283948NA
Hope1294350NA
Indpls - I-70 E1153046NA
Kokomo - E. Vaile Ave.1294045NA
Helmsburg1324654NA
AreaMonitoring SitePOCApril 2020
1234
South West
Boonville1334353NA
Evansville-Buena Vista Rd1344153NA
Inglefield1314052NA
St. Philips1344554NA
Leopold1334556NA
Dayville1344454NA
Plummer1324452NA
AreaMonitoring SitePOCApril 2020
1234
South East
New Albany1304352NA
Charlestown State Park1294557NA
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NA - Data not available.

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.