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Peak Daily One-Hour Ozone Averages for April 2020

The table below lists the peak daily one-hour ozone concentrations measured in April 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 SitePOCApril 2020
North West
Hammond-141st St13033512643454235
Ogden Dunes13140594344524840
Michigan City-W. Michigan Blvd13237574144514541
LaPorte-E. Lincolnway13142553441494643
AreaMonitoring SitePOCApril 2020
North Central
South Bend-Shields Dr120NA532847494027
Potato Creek State Park13445554449524946
Granger-Beckley St13045583352524746
AreaMonitoring SitePOCApril 2020
North East
Fort Wayne-Beacon St12546543639514847
Leo HS12446543641494748
AreaMonitoring SitePOCApril 2020
West Central
Terre Haute-Lafayette Ave13144531131364251
West Union13447562331374149
AreaMonitoring SitePOCApril 2020
East Central
Indpls-Washington Park13147561929414653
Indpls-Harding St13149593832404752
Indpls-Ft. Harrison12944533426404454
Noblesville-191st St13141532532454753
Indpls - I-70 E11936542824354148
Kokomo - E. Vaile Ave.13243532425284648
AreaMonitoring SitePOCApril 2020
South West
Evansville-Buena Vista Rd13944562831474655
St. Philips13849563528444753
AreaMonitoring SitePOCApril 2020
South East
New Albany13348596931434353
Charlestown State Park13249607135464452
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.