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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 St1404144395146524235425258535238586149651Hammond-141st St
Ogden Dunes1414744406145544640415663545444595953611Ogden Dunes
Michigan City-W. Michigan Blvd1424450416642564936515363635539607254601Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway1434248395850564835395355605040515462561LaPorte-E. Lincolnway
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
North Central
South Bend-Shields Dr1394350425146514735395052504938565755541South Bend-Shields Dr
Potato Creek State Park1404848395550515036404957474941555763551Potato Creek State Park
Granger-Beckley St1404351454944524837415153514839525453561Granger-Beckley St
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
North East
Fort Wayne-Beacon St1424747424747524638455550574442514455531Fort Wayne-Beacon St
Leo HS1414549464648544341465854574544484855561Leo HS
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
West Central
Terre Haute-Lafayette Ave1474348344448554438445155473544514753501Terre Haute-Lafayette Ave
West Union1454752274349554537405154483745504744461West Union
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
East Central
Anderson-Eastside Elem. School2464449414849604641495457633941515855542Anderson-Eastside Elem. School
Indpls-Washington Park14845533948496046455056535238424931NANA1Indpls-Washington Park
Indpls-Harding St1474951414746594442435353453343484567551Indpls-Harding St
Indpls-Ft. Harrison1494554394749604644515654553740496058561Indpls-Ft. Harrison
Noblesville-191st St1494553384948624640545853573841495955541Noblesville-191st St
Indpls - I-70 E1384150394345584236455351473536464561561Indpls - I-70 E
Kokomo - E. Vaile Ave.1434651385751554245525552544146514664561Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
South West
Evansville-Buena Vista Rd1485156404347514537484450383341413637261Evansville-Buena Vista Rd
St. Philips1485368394351554840474956423843403840301St. Philips
AreaMonitoring SitePOCSeptember 2021POCMonitoring Site
South East
New Albany1425558484148524840504544443346434749411New Albany
Charlestown State Park1405447524449644740514846453841434449391Charlestown 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.