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Peak Daily One-Hour Ozone Averages for July 2020

The table below lists the peak daily one-hour ozone concentrations measured in July 2020 in each community where the IDEM measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

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 using AQI colors
AreaMonitoring SitePOCJuly 2020
North West
Hammond-141st St17362685949897666
Ogden Dunes17370786248857583
Michigan City-W. Michigan Blvd16868775948778476
LaPorte-E. Lincolnway16661645357567867
AreaMonitoring SitePOCJuly 2020
North Central
South Bend-Shields Dr16360665057597069
Potato Creek State Park16664715659626766
Granger-Beckley St15657675459617164
AreaMonitoring SitePOCJuly 2020
North East
Fort Wayne-Beacon St15657615960687075
Leo HS15457606065756873
AreaMonitoring SitePOCJuly 2020
West Central
Terre Haute-Lafayette Ave15271636058676463
West Union14759616259565557
AreaMonitoring SitePOCJuly 2020
East Central
Indpls-Washington Park15955665873686570
Indpls-Harding St15859686273626173
Indpls-Ft. Harrison15854625262706163
Noblesville-191st St16258615462696260
Indpls - I-70 E15350585373655958
Kokomo - E. Vaile Ave.16964675861666660
AreaMonitoring SitePOCJuly 2020
South West
Evansville-Buena Vista Rd16663686968587354
St. Philips15568676669546251
AreaMonitoring SitePOCJuly 2020
South East
New Albany15761667353819171
Charlestown State Park14158646549156357
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.