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Peak Daily One-Hour Ozone Averages for October 2018

The table below lists the peak daily one-hour ozone concentrations measured in October 2018 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 SitePOCOctober 2018POCMonitoring Site
North West
Hammond-141st St1271531291520183232172519282925NA31321Hammond-141st St
Ogden Dunes13725393621262242442730313438283635371Ogden Dunes
Michigan City-W. Michigan Blvd13531393724262045462934363742293737371Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway142243633232010NANA2232343537273733371LaPorte-E. Lincolnway
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
North Central
South Bend-Shields Dr14537393226221147422929333737263632371South Bend-Shields Dr
Potato Creek State Park1463336322421946392830303537273433371Potato Creek State Park
Granger-Beckley St1413739322620946382830323636283633341Granger-Beckley St
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
North East
Fort Wayne-Beacon St15635433328351151392621373740303631371Fort Wayne-Beacon St
Leo HS15737423428361452402726383638303631381Leo HS
Roanoke Elem. School16136423125332551382725363639283530371Roanoke Elem. School
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
West Central
Terre Haute-Lafayette Ave15138413242444946413031323432283436421Terre Haute-Lafayette Ave
West Union14939383041435045412731303527263235391West Union
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
East Central
Indpls-Washington Park1463241262343454743252731322826NANANA1Indpls-Washington Park
Indpls-Harding St14331362723434243422726283530253331311Indpls-Harding St
Indpls-Ft. Harrison1NA31382620414343382225293127253431321Indpls-Ft. Harrison
Noblesville-191st St15434432923445152432628323234263831381Noblesville-191st St
Indpls - I-70 E14629412525444446422620243529163026251Indpls - I-70 E
Kokomo - E. Vaile Ave.15134383029373811NANA28333535253427381Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
South West
Evansville-Buena Vista Rd14536372835403940342525302818162234351Evansville-Buena Vista Rd
St. Philips14240423242474443403129373019212838401St. Philips
AreaMonitoring SitePOCOctober 2018POCMonitoring Site
South East
New Albany1NA34323442404738402726393321181939391New Albany
Charlestown State Park14641413547485944383017393421192038401Charlestown 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.