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Peak Daily One-Hour Ozone Averages for June 2021

The table below lists the peak daily one-hour ozone concentrations measured in June 2021 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 SitePOCJune 2021
North West
Hammond-141st St16664877262652461585478
Ogden Dunes14470957260632870685673
Michigan City-W. Michigan Blvd16072968061632969685777
LaPorte-E. Lincolnway16456857361622748555461
AreaMonitoring SitePOCJune 2021
North Central
South Bend-Shields Dr16754737561602846595270
Potato Creek State Park16452736857582547634870
Granger-Beckley St16855767965643148574764
AreaMonitoring SitePOCJune 2021
North East
Fort Wayne-Beacon St15334616256532842394957
Leo HS16041697468633447465665
AreaMonitoring SitePOCJune 2021
West Central
Terre Haute-Lafayette Ave15431636557373740393882
West Union15435626827NANA35374150
AreaMonitoring SitePOCJune 2021
East Central
Anderson-Eastside Elem. School25946537170553740394359
Indpls-Washington Park16038536752453335373958
Indpls-Harding St15639516659373232383757
Indpls-Ft. Harrison15943577264483839353860
Noblesville-191st St16443637065534041414259
Indpls - I-70 E15839446558433334363749
Kokomo - E. Vaile Ave.16338686569633949424873
AreaMonitoring SitePOCJune 2021
South West
Evansville-Buena Vista Rd13630456953342733333943
St. Philips13228476750292729323843
AreaMonitoring SitePOCJune 2021
South East
New Albany15032477558433428294639
Charlestown State Park14734447667383235315638
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.