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Eight-Hour Ozone High Value Days for 2020
as of November 24

The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 71 parts per billion in 2020 in each community where the IDEM measures ozone. This information is updated hourly. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) Times shown are in 24-hour format and are Local Standard Time. Our convention is that the time reflects the beginning of the eight-hour average. All ozone measurements are in parts per billion.

Use the selection boxes below to customize this report. You may select a different year, a different sorting order, or a different report format. Click on the Generate Report button once you have made your selections.

YearSort ByReport Format
Highlight with AQI colors
2020 Sorted by Maximum Value
LocationRegionSite CAMSAQSDateTimeValuePOC
Michigan City-W. Michigan Blvd 1 1618_091_0005June 19 202010:00871
Ogden Dunes 1O Dunes 1318_127_0024June 19 202010:00861
Michigan City-W. Michigan Blvd 1 1618_091_0005June 5 202015:00841
New Albany 7 318_043_1004July 7 202011:00831
Hammond-141st St 1 618_089_2008June 19 202010:00811
Michigan City-W. Michigan Blvd 1 1618_091_0005June 18 202011:00811
Ogden Dunes 1O Dunes 1318_127_0024June 5 202019:00811
Gary-IITRI 1 3118_089_0022June 5 202020:00801
Gary-IITRI 1 3118_089_0022June 19 202011:00801
Ogden Dunes 1O Dunes 1318_127_0024June 18 202009:00801
Michigan City-W. Michigan Blvd 1 1618_091_0005June 17 202012:00791
Valparaiso 1 2818_127_0026June 18 202010:00781
Gary-IITRI 1 3118_089_0022June 18 202010:00771
Hammond-141st St 1 618_089_2008June 18 202011:00761
Hammond-141st St 1 618_089_2008July 6 202010:00761
Ogden Dunes 1O Dunes 1318_127_0024June 17 202011:00761
Valparaiso 1 2818_127_0026June 19 202010:00761
South Bend-Shields Dr 2 518_141_0015June 19 202011:00751
Granger-Beckley St 2 7418_141_0016June 19 202010:00751
Fairland 5 6818_145_0001June 19 202010:00751
Gary-IITRI 1 3118_089_0022June 17 202011:00741
Michigan City-W. Michigan Blvd 1 1618_091_0005July 3 202011:00741
LaPorte-E. Lincolnway 1 3418_091_0010June 19 202009:00741
Ogden Dunes 1O Dunes 1318_127_0024July 3 202011:00741
St. Philips 6 3318_129_0003June 6 202011:00741
Dayville 6 5218_173_0011June 6 202010:00741
Kokomo - E. Vaile Ave. 5 7918_067_0004June 19 202009:00731
Michigan City-W. Michigan Blvd 1 1618_091_0005July 7 202010:00731
LaPorte-E. Lincolnway 1 3418_091_0010June 18 202010:00731
Indpls-Washington Park 5 4218_097_0078June 19 202010:00731
South Bend-Shields Dr 2 518_141_0015June 18 202012:00731
Leopold 6 4918_123_0009June 19 202010:00721
Ogden Dunes 1O Dunes 1318_127_0024July 6 202010:00721
Potato Creek State Park 2 2118_141_0010June 18 202011:00721
Granger-Beckley St 2 7418_141_0016June 18 202011:00721
Whitestown 5 6518_011_0001June 19 202010:00711
Whitestown 5 6518_011_0001June 20 202011:00711
Gary-IITRI 1 3118_089_0022July 3 202011:00711
Hammond-141st St 1 618_089_2008June 5 202020:00711
LaPorte-E. Lincolnway 1 3418_091_0010June 17 202011:00711
Indpls-Ft. Harrison 5 6018_097_0050June 19 202011:00711
Valparaiso 1 2818_127_0026June 17 202011:00711
Potato Creek State Park 2 2118_141_0010June 17 202011:00711
Granger-Beckley St 2 7418_141_0016June 17 202011:00711
Evansville-Buena Vista Rd 6 1518_163_0021June 6 202011:00711
Boonville 6 1218_173_0008June 18 202010:00711
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.

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.