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Peak Daily One-Hour Ozone Averages for September 2021

The table below lists the peak daily one-hour ozone concentrations measured in September 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 SitePOCSeptember 2021POCMonitoring Site
12345678910111213141516171819202122232425
North West
Hammond-141st St1404144395146524235425258535238586149653437303252391Hammond-141st St
Ogden Dunes1414744406145544640415663545444595953613740343749411Ogden Dunes
Michigan City-W. Michigan Blvd1424450416642564936515363635539607254603941334049421Michigan City-W. Michigan Blvd
Valparaiso1424748403154574637405555555143515663583836323450411Valparaiso
Gary-IITRI1374144375642513936395156505241595450572935303146381Gary-IITRI
LaPorte-E. Lincolnway1434248395850564835395355605040515462563428283746431LaPorte-E. Lincolnway
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
12345678910111213141516171819202122232425
North Central
South Bend-Shields Dr1394350425146514735395052504938565755544227323446441South Bend-Shields Dr
Bristol1384452465043522938445260534640556055574134NANANANA1Bristol
Potato Creek State Park1404848395550515036404957474941555763553826283546431Potato Creek State Park
Granger-Beckley St1404351454944524837415153514839525453564229323546451Granger-Beckley St
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
12345678910111213141516171819202122232425
North East
Fort Wayne-Beacon St1424747424747524638455550574442514455533132233443381Fort Wayne-Beacon St
Leo HS1414549464648544341465854574544484855563125243745401Leo HS
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
12345678910111213141516171819202122232425
West Central
Terre Haute-Lafayette Ave1474348344448554438445155473544514753503137273647421Terre Haute-Lafayette Ave
Flora1434451475448534146445154474350514758582929233545411Flora
Sandcut146424329444856463647495447334148434NA3134253747431Sandcut
West Union1454752274349554537405154483745504744463128253745411West Union
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
12345678910111213141516171819202122232425
East Central
Anderson-Eastside Elem. School2464449414849604641495457633941515855542944433348392Anderson-Eastside Elem. School
Albany1453944434645564736485157524235454651512838393548391Albany
Indpls-Washington Park14845533948496046455056535238424931NANANANA343344381Indpls-Washington Park
Indpls-Harding St1474951414746594442435353453343484567552436373142381Indpls-Harding St
Indpls-Ft. Harrison1494554394749604644515654553740496058562534423446411Indpls-Ft. Harrison
Whitestown1454964335049564444465254513943584360622741273549411Whitestown
Avon1455251414647554440435554453843494169562439283348401Avon
Fairland1424351414750564942505054483840454453612335373545401Fairland
Noblesville-191st St1494553384948624640545853573841495955542636373446411Noblesville-191st St
Hope1434151454548525146464955473340494649592330383244401Hope
Indpls - I-70 E1384150394345584236455351473536464561562533372845361Indpls - I-70 E
Kokomo - E. Vaile Ave.1434651385751554245525552544146514664563438273347431Kokomo - E. Vaile Ave.
Helmsburg1474647374246544539385053473344433144472133323146381Helmsburg
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
12345678910111213141516171819202122232425
South West
Boonville1475155434352564640494552443540393639273132313447431Boonville
Evansville-Buena Vista Rd14851564043475145374844503833414136372631312931NANA1Evansville-Buena Vista Rd
Inglefield1474951384345534638514753393241383439252932293251401Inglefield
St. Philips148536839435155484047495642384340384030323224NANA431St. Philips
Leopold1505563454148565042484750513943383242382928363449441Leopold
Dayville1455055434150564541434448453443393634222931293345421Dayville
Plummer1484647404452594540465954473439134045472837333752441Plummer
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
12345678910111213141516171819202122232425
South East
New Albany1425558484148524840504544443346434749412623393543391New Albany
Charlestown State Park1405447524449644740514846453841434449392526373647391Charlestown State Park
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.