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Daily Maximum Eight-Hour Ozone Averages for December 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in December 2019 in each community where the IDEM measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

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 with AQI colors
AreaMonitoring SitePOCDecember 2019
123456789101112
North West
Hammond-141st St1272520272031202320231610
Ogden Dunes1343523282533232620241713
Michigan City-W. Michigan Blvd1353827352635263025272418
Valparaiso1293024252531222722262012
Gary-IITRI1333323202232232420241714
LaPorte-E. Lincolnway1283424312532242823212013
AreaMonitoring SitePOCDecember 2019
123456789101112
North Central
South Bend-Shields Dr1233123302531243125212211
Bristol1213023312429232923202312
Potato Creek State Park1253325312833273227242217
Granger-Beckley St1223022302231NANANANANANA
AreaMonitoring SitePOCDecember 2019
123456789101112
North East
Fort Wayne-Beacon St115282328272926292426249
Leo HS1173025312831273025262810
Roanoke Elem. School1183221272128232725262311
AreaMonitoring SitePOCDecember 2019
123456789101112
West Central
Terre Haute-Lafayette Ave124272328202623322327179
Flora1263027282633253428312512
Sandcut1273026302530273525292118
West Union1283126312627253529312211
AreaMonitoring SitePOCDecember 2019
123456789101112
East Central
Emporia1232824292727272827281913
Albany1212925282826273228262213
Indpls-Washington Park12325232923NVNANANANANANA
Indpls-Harding St123242227222125302326169
Indpls-Ft. Harrison121262329232826262228209
Monrovia1242827292927263628282214
Whitestown125272628232924322628214
Avon125272629232623332427196
Fairland1242627292722252825292212
Noblesville-191st St122282529222924282429218
Hope1272727332725283129312514
Indpls - I-70 E120201919231525292118108
Kokomo - E. Vaile Ave.125292326232823292428219
Helmsburg124292833272228352931247
AreaMonitoring SitePOCDecember 2019
123456789101112
South West
Boonville126302731232527332630258
Evansville-Buena Vista Rd125312633242625342733254
Inglefield1262924292725283526312411
St. Philips1273127313325263529322719
Leopold1292930313326263628313121
Dayville1273029332923283328312715
Plummer1253028312728303226322418
AreaMonitoring SitePOCDecember 2019
123456789101112
South East
New Albany124272732182324272632NVNA
Charlestown State Park1282727332420303329332612
Brownstown1NA3030353026263529342713
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.