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Daily Maximum Eight-Hour Ozone Averages for September 2020

The table below lists the peak daily maximum eight-hour ozone concentrations measured in September 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 SitePOCSeptember 2020POCMonitoring Site
North West
Hammond-141st St13140403641323120242529NANA313244303237434042NA1Hammond-141st St
Ogden Dunes135464442433432212424282130333716101012134052NA1Ogden Dunes
Michigan City-W. Michigan Blvd134494339413327182120272126293444303336423955NA1Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway129474440433529161315292027273242303437434051NA1LaPorte-E. Lincolnway
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
North Central
South Bend-Shields Dr135434236413630171915302626253238283136403945NA1South Bend-Shields Dr
Potato Creek State Park131404136413429171812292126233036293234403944NA1Potato Creek State Park
Granger-Beckley St1354245384439321716163224282431422933384241NVNA1Granger-Beckley St
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
North East
Fort Wayne-Beacon St146424440444332343615283634242941283236NV4146NA1Fort Wayne-Beacon St
Leo HS146424539454333333517303835252840303337424147NA1Leo HS
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
West Central
Terre Haute-Lafayette Ave133284636394037405527253231353442363438443947NA1Terre Haute-Lafayette Ave
West Union127244535404137385334243329383138413638434144NA1West Union
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
East Central
Indpls-Washington Park135314338423834484830333535333342343638434147NA1Indpls-Washington Park
Indpls-Harding St133NVNANA42363346483036NA35343738353741444347NA1Indpls-Harding St
Indpls-Ft. Harrison1373145394441365049313437353335433437374443NVNA1Indpls-Ft. Harrison
Noblesville-191st St138304137413931494626293931293240253637NV42NVNA1Noblesville-191st St
Indpls - I-70 E133183327393630464518303225202936232335414135NA1Indpls - I-70 E
Kokomo - E. Vaile Ave.147394443454233414822334237293347263637434351NA1Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
South West
Evansville-Buena Vista Rd129302934424137455853292736433636523739424141NA1Evansville-Buena Vista Rd
St. Philips130312934424239465256262134393232473334373637NA1St. Philips
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
South East
New Albany138333438453936NV4651273726443032493438374539NA1New Albany
Charlestown State Park135323437494839503941262925422732513436364040NA1Charlestown State Park
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.