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Eight-Hour Ozone High Value Days for 2018
as of October 19

The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 71 parts per billion in 2018 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
2018 Sorted by Maximum Value
LocationRegionCAMSAQSDateTimeValuePOC
Michigan City-W. Michigan Blvd 1 1618_091_0005May 25 201811:00901
Gary-IITRI 1 3118_089_0022May 25 201810:00861
Ogden Dunes 1 1318_127_0024May 27 201810:00851
Gary-IITRI 1 3118_089_0022May 27 201811:00841
Gary-IITRI 1 3118_089_0022May 28 201810:00841
Michigan City-W. Michigan Blvd 1 1618_091_0005May 28 201810:00841
Michigan City-W. Michigan Blvd 1 1618_091_0005July 9 201810:00841
Ogden Dunes 1 1318_127_0024May 25 201809:00841
Ogden Dunes 1 1318_127_0024May 28 201810:00841
New Albany 7 318_043_1004June 16 201811:00831
Evansville-Buena Vista Rd 6 1518_163_0021July 13 201811:00831
Michigan City-W. Michigan Blvd 1 1618_091_0005May 27 201811:00821
New Albany 7 318_043_1004June 15 201811:00811
Emporia 5 2518_095_0010May 25 201811:00811
Indpls-Ft. Harrison 5 6018_097_0050June 15 201811:00801
Indpls-Washington Park 5 4218_097_0078July 13 201811:00801
Valparaiso 1 2818_127_0026May 28 201811:00801
South Bend-Shields Dr 2 518_141_0015May 28 201810:00801
Albany 5 4018_035_0010May 25 201812:00791
Plummer 6 6718_055_0001June 8 201811:00791
Noblesville-191st St 5 7118_057_0006June 15 201811:00791
LaPorte-E. Lincolnway 1 3418_091_0010May 28 201809:00791
New Albany 7 318_043_1004July 14 201812:00781
Plummer 6 6718_055_0001June 7 201812:00781
Indpls-Ft. Harrison 5 6018_097_0050May 25 201811:00781
Indpls-Ft. Harrison 5 6018_097_0050June 8 201810:00781
Indpls-Harding St 5 5618_097_0057July 14 201811:00781
Boonville 6 1218_173_0008July 13 201810:00781
Leo HS 3 1918_003_0002May 25 201811:00771
Charlestown State Park 7 418_019_0008June 8 201810:00771
Indpls-Washington Park 5 4218_097_0078June 15 201811:00771
Indpls - I-70 E 5 7818_097_0087July 13 201811:00771
Valparaiso 1 2818_127_0026May 26 201811:00771
Noblesville-191st St 5 7118_057_0006May 25 201811:00761
Noblesville-191st St 5 7118_057_0006July 13 201810:00761
Emporia 5 2518_095_0010June 8 201810:00761
Indpls-Ft. Harrison 5 6018_097_0050June 7 201811:00761
Indpls-Harding St 5 5618_097_0057May 27 201810:00761
Indpls-Harding St 5 5618_097_0057May 28 201810:00761
South Bend-Shields Dr 2 518_141_0015July 9 201811:00761
Granger-Beckley St 2 7418_141_0016July 9 201812:00761
Inglefield 6 2418_163_0013July 13 201810:00761
Flora 4 3618_015_0002May 25 201811:00751
Charlestown State Park 7 418_019_0008June 15 201811:00751
LaPorte-E. Lincolnway 1 3418_091_0010May 26 201811:00751
LaPorte-E. Lincolnway 1 3418_091_0010May 27 201810:00751
Indpls-Harding St 5 5618_097_0057June 15 201811:00751
Potato Creek State Park 2 2118_141_0010May 28 201810:00751
Granger-Beckley St 2 7418_141_0016May 28 201810:00751
Evansville-Buena Vista Rd 6 1518_163_0021June 7 201810:00751
Sandcut 4 3718_167_0024May 25 201810:00751
Boonville 6 1218_173_0008June 7 201811:00751
Whitestown 5 6518_011_0001May 28 201810:00741
Flora 4 3618_015_0002May 27 201810:00741
Michigan City-W. Michigan Blvd 1 1618_091_0005May 26 201810:00741
Emporia 5 2518_095_0010May 27 201811:00741
Indpls-Harding St 5 5618_097_0057June 8 201811:00741
Indpls-Harding St 5 5618_097_0057July 13 201811:00741
South Bend-Shields Dr 2 518_141_0015May 25 201811:00741
Fairland 5 6818_145_0001July 14 201811:00741
Terre Haute-Lafayette Ave 4 918_167_0018May 25 201810:00741
Terre Haute-Lafayette Ave 4 918_167_0018June 8 201812:00741
Terre Haute-Lafayette Ave 4 918_167_0018July 13 201811:00741
Sandcut 4 3718_167_0024July 13 201811:00741
Leo HS 3 1918_003_0002May 27 201810:00731
Leo HS 3 1918_003_0002May 28 201810:00731
Fort Wayne-Beacon St 3 718_003_0004May 25 201811:00731
Hope 5 7618_005_0007May 25 201811:00731
Hope 5 7618_005_0007July 14 201810:00731
Whitestown 5 6518_011_0001May 25 201810:00731
Whitestown 5 6518_011_0001May 27 201811:00731
Whitestown 5 6518_011_0001June 8 201810:00731
Charlestown State Park 7 418_019_0008June 7 201811:00731
New Albany 7 318_043_1004June 7 201811:00731
Avon 5 6618_063_0004June 8 201811:00731
Kokomo - E. Vaile Ave. 5 7918_067_0004May 25 201810:00731
Kokomo - E. Vaile Ave. 5 7918_067_0004May 27 201810:00731
Kokomo - E. Vaile Ave. 5 7918_067_0004June 15 201812:00731
Michigan City-W. Michigan Blvd 1 1618_091_0005May 5 201812:00731
Indpls-Washington Park 5 4218_097_0078July 14 201811:00731
Valparaiso 1 2818_127_0026May 27 201810:00731
Potato Creek State Park 2 2118_141_0010May 26 201812:00731
South Bend-Shields Dr 2 518_141_0015May 27 201811:00731
Granger-Beckley St 2 7418_141_0016May 25 201811:00731
Fairland 5 6818_145_0001May 27 201810:00731
Fairland 5 6818_145_0001June 8 201811:00731
Inglefield 6 2418_163_0013June 7 201809:00731
Evansville-Buena Vista Rd 6 1518_163_0021June 15 201811:00731
Boonville 6 1218_173_0008June 8 201810:00731
Leo HS 3 1918_003_0002July 13 201810:00721
Hope 5 7618_005_0007June 7 201812:00721
Flora 4 3618_015_0002May 28 201811:00721
Bristol 2 1818_039_0007May 25 201811:00721
Bristol 2 1818_039_0007July 9 201811:00721
Plummer 6 6718_055_0001May 25 201810:00721
Kokomo - E. Vaile Ave. 5 7918_067_0004May 28 201811:00721
Kokomo - E. Vaile Ave. 5 7918_067_0004July 13 201812:00721
Michigan City-W. Michigan Blvd 1 1618_091_0005July 15 201810:00721
Emporia 5 2518_095_0010May 28 201810:00721
Emporia 5 2518_095_0010June 7 201811:00721
Indpls-Harding St 5 5618_097_0057May 25 201811:00721
Indpls-Washington Park 5 4218_097_0078May 25 201810:00721
Indpls-Washington Park 5 4218_097_0078June 8 201811:00721
Potato Creek State Park 2 2118_141_0010May 25 201811:00721
South Bend-Shields Dr 2 518_141_0015May 26 201812:00721
South Bend-Shields Dr 2 518_141_0015May 29 201809:00721
Fairland 5 6818_145_0001May 28 201811:00721
West Union 4 3817_023_0001May 25 201809:00711
Leo HS 3 1918_003_0002June 7 201812:00711
Leo HS 3 1918_003_0002June 15 201811:00711
Fort Wayne-Beacon St 3 718_003_0004June 15 201812:00711
Whitestown 5 6518_011_0001July 13 201810:00711
Charlestown State Park 7 418_019_0008July 14 201809:00711
Albany 5 4018_035_0010May 28 201810:00711
Albany 5 4018_035_0010June 15 201811:00711
Bristol 2 1818_039_0007May 28 201810:00711
New Albany 7 318_043_1004July 13 201811:00711
Noblesville-191st St 5 7118_057_0006May 28 201811:00711
Noblesville-191st St 5 7118_057_0006June 8 201810:00711
Avon 5 6618_063_0004June 28 201810:00711
Gary-IITRI 1 3118_089_0022May 26 201811:00711
LaPorte-E. Lincolnway 1 3418_091_0010May 25 201809:00711
Emporia 5 2518_095_0010June 16 201810:00711
Indpls-Washington Park 5 4218_097_0078May 27 201811:00711
Indpls-Washington Park 5 4218_097_0078May 28 201810:00711
Indpls - I-70 E 5 7818_097_0087May 25 201812:00711
Indpls - I-70 E 5 7818_097_0087June 15 201812:00711
Ogden Dunes 1 1318_127_0024May 26 201810:00711
Valparaiso 1 2818_127_0026May 25 201810:00711
South Bend-Shields Dr 2 518_141_0015June 15 201812:00711
Fairland 5 6818_145_0001June 7 201812:00711
Sandcut 4 3718_167_0024June 8 201811:00711
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.