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Daily Maximum Eight-Hour Ozone Averages for September 2021

The table below lists the peak daily maximum eight-hour ozone concentrations measured in September 2021 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 2021POCMonitoring Site
1234567891011121314151617181920212223242526
North West
Hammond-141st St137373936484346383438505249453754544655263329274636451Hammond-141st St
Ogden Dunes139413637534149423637515448494053545052253731314638451Ogden Dunes
Michigan City-W. Michigan Blvd139404439574049423440505253483754674852293631354539441Michigan City-W. Michigan Blvd
Valparaiso140404237NA4951403438525251483949525852283030284739451Valparaiso
Gary-IITRI136393534483944363436485043443852504751223328264235421Gary-IITRI
LaPorte-E. Lincolnway138384236494449423337495149463749505451222628324338431LaPorte-E. Lincolnway
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
1234567891011121314151617181920212223242526
North Central
South Bend-Shields Dr137404638464247403338464946403651515150282726314340431South Bend-Shields Dr
Bristol1364146414641NVNA364149554841365052495227NVNANANANANA1Bristol
Potato Creek State Park138414035474347423536465042433750485546272327324439421Potato Creek State Park
Granger-Beckley St137394639454147413439475048413648514850272627334341431Granger-Beckley St
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
1234567891011121314151617181920212223242526
North East
Fort Wayne-Beacon St137424440444449433642504749363746425148242526324135411Fort Wayne-Beacon St
Leo HS13841444343455139374254515039394645515126NV27344237441Leo HS
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
1234567891011121314151617181920212223242526
West Central
Terre Haute-Lafayette Ave143404425404451403540494844323847424946272622334438431Terre Haute-Lafayette Ave
Flora141414734484447404041485044384248445652262520294238431Flora
Sandcut14238NV24394553413341484744313543NVNANA272521324237411Sandcut
West Union141404423384552403437484742333845393939262322334338421West Union
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
1234567891011121314151617181920212223242526
East Central
Anderson-Eastside Elem. School242414536434555413845515352373646495049253730294337452Anderson-Eastside Elem. School
Albany138354036404152383341485248363141434745253126324336461Albany
Indpls-Washington Park1444248324346544341435250463238NVNANANANANA25273935431Indpls-Washington Park
Indpls-Harding St144444732434450413838494942293843405950203328263935421Indpls-Harding St
Indpls-Ft. Harrison144414932424755424045525148343744515153223632284137451Indpls-Ft. Harrison
Whitestown142455729464553414243505147343953415657233423294439461Whitestown
Avon142484629414352413740504842313645375448213323284236431Avon
Fairland140384633424752453945465046323440414955213330304138441Fairland
Noblesville-191st St144424831444557443847535150353745534950223328294337451Noblesville-191st St
Hope139374540404550464244444438283443414449213432284137451Hope
Indpls - I-70 E135364631384352323140494642303142405350183126223932421Indpls - I-70 E
Kokomo - E. Vaile Ave.140424834504651413947505147364048445852263424284339441Kokomo - E. Vaile Ave.
Helmsburg143394134374150413535444740303236283434203028273634401Helmsburg
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
1234567891011121314151617181920212223242526
South West
Boonville143475040374852433746424440323936313423272625314439461Boonville
Evansville-Buena Vista Rd144475237384349413641414235303935323222272525NVNANANA1Evansville-Buena Vista Rd
Inglefield143454735384351433642444437313833323122242424294437421Inglefield
St. Philips1454857353946524538434746383338363334232725NANANA40441St. Philips
Leopold143515441344552473943454444354033303530253029304639451Leopold
Dayville140464938334152433739414338314034302919252625304338431Dayville
Plummer14442433539495543374351504332NVNA374141262926344840481Plummer
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
1234567891011121314151617181920212223242526
South East
New Albany139505142324649443843434142304136394331202831293936431New Albany
Charlestown State Park138474346344557443843454343343736364030232732314037441Charlestown 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.