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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
North West
Hammond-141st St1404144395146524235425258535238586149653437303252391Hammond-141st St
Ogden Dunes1414744406145544640415663545444595953613740343749411Ogden Dunes
Michigan City-W. Michigan Blvd1424450416642564936515363635539607254603941334049421Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway1434248395850564835395355605040515462563428283746431LaPorte-E. Lincolnway
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
North Central
South Bend-Shields Dr1394350425146514735395052504938565755544227323446441South Bend-Shields Dr
Potato Creek State Park1404848395550515036404957474941555763553826283546431Potato Creek State Park
Granger-Beckley St1404351454944524837415153514839525453564229323546451Granger-Beckley St
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
North East
Fort Wayne-Beacon St1424747424747524638455550574442514455533132233443381Fort Wayne-Beacon St
Leo HS1414549464648544341465854574544484855563125243745401Leo HS
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
West Central
Terre Haute-Lafayette Ave1474348344448554438445155473544514753503137273647421Terre Haute-Lafayette Ave
West Union1454752274349554537405154483745504744463128253745411West Union
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
East Central
Anderson-Eastside Elem. School2464449414849604641495457633941515855542944433348392Anderson-Eastside Elem. School
Indpls-Washington Park14845533948496046455056535238424931NANANANA343344381Indpls-Washington Park
Indpls-Harding St1474951414746594442435353453343484567552436373142381Indpls-Harding St
Indpls-Ft. Harrison1494554394749604644515654553740496058562534423446411Indpls-Ft. Harrison
Noblesville-191st St1494553384948624640545853573841495955542636373446411Noblesville-191st St
Indpls - I-70 E1384150394345584236455351473536464561562533372845361Indpls - I-70 E
Kokomo - E. Vaile Ave.1434651385751554245525552544146514664563438273347431Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
South West
Evansville-Buena Vista Rd14851564043475145374844503833414136372631312931NANA1Evansville-Buena Vista Rd
St. Philips148536839435155484047495642384340384030323224NANA431St. Philips
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
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.