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Eight-Hour Ozone High Value Days for 2017
as of August 21

The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 71 parts per billion in 2017 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.

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YearSort ByReport Format
Highlight with AQI colors
2017 Sorted by Maximum Value
LocationRegionCAMSAQSDateTimeValuePOC
Michigan City-W. Michigan Blvd 1 1618_091_0005June 9 201711:00841
Hammond-141st St 1 618_089_2008July 18 201711:00831
LaPorte-E. Lincolnway 1 3418_091_0010July 18 201710:00811
Valparaiso 1 2818_127_0026June 9 201711:00811
Michigan City-W. Michigan Blvd 1 1618_091_0005June 13 201710:00801
LaPorte-E. Lincolnway 1 3418_091_0010June 9 201711:00801
Ogden Dunes 1 1318_127_0024June 9 201711:00801
South Bend-Shields Dr 2 518_141_0015June 9 201712:00801
Gary-IITRI 1 3118_089_0022July 18 201710:00791
Michigan City-W. Michigan Blvd 1 1618_091_0005June 4 201712:00791
Ogden Dunes 1 1318_127_0024July 18 201710:00791
Potato Creek State Park 2 2118_141_0010June 9 201713:00791
Valparaiso 1 2818_127_0026June 3 201710:00781
St. Philips 6 3318_129_0003June 2 201710:00781
Gary-IITRI 1 3118_089_0022June 9 201711:00771
Michigan City-W. Michigan Blvd 1 1618_091_0005June 15 201711:00771
Valparaiso 1 2818_127_0026June 15 201711:00771
Valparaiso 1 2818_127_0026July 18 201709:00771
Granger-Beckley St 2 7418_141_0016June 9 201712:00771
New Albany 7 318_043_1004June 3 201711:00751
New Albany 7 318_043_1004June 4 201710:00751
Gary-IITRI 1 3118_089_0022June 2 201710:00751
Hammond-141st St 1 618_089_2008June 15 201711:00751
Michigan City-W. Michigan Blvd 1 1618_091_0005June 3 201712:00751
Valparaiso 1 2818_127_0026July 6 201711:00751
Inglefield 6 2418_163_0013June 2 201710:00751
Albany 5 4018_035_0010June 3 201711:00741
New Albany 7 318_043_1004June 16 201711:00741
New Albany 7 318_043_1004July 17 201712:00741
Boonville 6 1218_173_0008June 2 201710:00741
Dayville 6 5218_173_0011June 2 201710:00741
Michigan City-W. Michigan Blvd 1 1618_091_0005July 18 201712:00731
LaPorte-E. Lincolnway 1 3418_091_0010June 3 201710:00731
Valparaiso 1 2818_127_0026July 19 201711:00731
St. Philips 6 3318_129_0003June 3 201710:00731
South Bend-Shields Dr 2 518_141_0015June 10 201713:00731
South Bend-Shields Dr 2 518_141_0015July 6 201711:00731
Fairland 5 6818_145_0001June 2 201712:00731
Boonville 6 1218_173_0008June 3 201710:00731
Dayville 6 5218_173_0011June 3 201710:00731
Leo HS 3 1918_003_0002June 10 201713:00721
Bristol 2 1818_039_0007June 9 201712:00721
New Albany 7 318_043_1004June 2 201711:00721
Noblesville-191st St 5 7118_057_0006June 10 201710:00721
Hammond-141st St 1 618_089_2008June 2 201710:00721
LaPorte-E. Lincolnway 1 3418_091_0010July 19 201709:00721
Emporia 5 2518_095_0010June 3 201710:00721
Ogden Dunes 1 1318_127_0024June 2 201710:00721
Ogden Dunes 1 1318_127_0024June 13 201709:00721
South Bend-Shields Dr 2 518_141_0015June 3 201711:00721
Terre Haute-Lafayette Ave 4 918_167_0018June 5 201712:00721
West Union 4 3817_023_0001June 5 201711:00711
Fort Wayne-Beacon St 3 718_003_0004June 10 201712:00711
Whitestown 5 6518_011_0001June 10 201711:00711
Charlestown State Park 7 418_019_0008June 3 201711:00711
Plummer 6 6718_055_0001May 15 201711:00711
Michigan City-W. Michigan Blvd 1 1618_091_0005June 10 201713:00711
Indpls-Ft. Harrison 5 6018_097_0050June 2 201711:00711
Indpls-Ft. Harrison 5 6018_097_0050June 4 201711:00711
Indpls-E.16th St 5 118_097_0073June 4 201711:00711
Leopold 6 4918_123_0009June 3 201709:00711
Ogden Dunes 1 1318_127_0024June 15 201710:00711
Valparaiso 1 2818_127_0026June 10 201712:00711
Inglefield 6 2418_163_0013June 3 201710:00711
Evansville-Buena Vista Rd 6 1518_163_0021June 2 201710:00711
Terre Haute-Lafayette Ave 4 918_167_0018June 10 201710:00711
Sandcut 4 3718_167_0024June 5 201712:00711
Sandcut 4 3718_167_0024June 10 201710:00711
Boonville 6 1218_173_0008May 15 201709:00711
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.