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Peak Daily One-Hour Ozone Averages for September 2020

The table below lists the peak daily one-hour ozone concentrations measured in September 2020 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 2020POCMonitoring Site
North West
Hammond-141st St1344645374535342828303520NA3536533633404645511Hammond-141st St
Ogden Dunes1375749484938352928283225334043221211141446601Ogden Dunes
Michigan City-W. Michigan Blvd1386345464639332425243027273538534035394344631Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway1345748455039351918183123293435463436414544581LaPorte-E. Lincolnway
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
North Central
South Bend-Shields Dr1404744384739372027173230283035413633404243491South Bend-Shields Dr
Potato Creek State Park1384843424937361925143127283034423134404243491Potato Creek State Park
Granger-Beckley St1394548425242412022173429312736463935434444191Granger-Beckley St
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
North East
Fort Wayne-Beacon St1494848495247364347203340372734463234404145511Fort Wayne-Beacon St
Leo HS1494749495547384545233941392834463434434546531Leo HS
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
West Central
Terre Haute-Lafayette Ave1393250394148394560333039354038484437424844511Terre Haute-Lafayette Ave
West Union1333049384448404263452941364537474939414745511West Union
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
East Central
Indpls-Washington Park1413746404542365150333940383739564439424545531Indpls-Washington Park
Indpls-Harding St139355NA4539354952334124373643514839454648521Indpls-Harding St
Indpls-Ft. Harrison1433848414845405455333843403639574541404649521Indpls-Ft. Harrison
Noblesville-191st St1433444404345335449303748343338512940414347521Noblesville-191st St
Indpls - I-70 E1392536304240354948213637282440463226394345461Indpls - I-70 E
Kokomo - E. Vaile Ave.1534247495146364757283950433237543139414447561Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
South West
Evansville-Buena Vista Rd1343331384749444768623333424642415641434548481Evansville-Buena Vista Rd
St. Philips1353333374649475258673033394339375337394142431St. Philips
AreaMonitoring SitePOCSeptember 2020POCMonitoring Site
South East
New Albany1453638405442386052592952315034405937423958451New Albany
Charlestown State Park1433438425858425843452839284832426036413947461Charlestown 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.