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Peak Daily One-Hour Ozone Averages for January 2018

The table below lists the peak daily one-hour ozone concentrations measured in January 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 SitePOCJanuary 2018POCMonitoring Site
North West
Hammond-141st St1292424282725272712282539303126252224262415311Hammond-141st St
Ogden Dunes1292833403738312918333142NANANANANA30342922361Ogden Dunes
Michigan City-W. Michigan Blvd1373033363738312818323040383128342931NANANANA1Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway1352933373735302818262539373030212731363220341LaPorte-E. Lincolnway
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
North Central
South Bend-Shields Dr1373029343532323220252837373331222731403421351South Bend-Shields Dr
Potato Creek State Park135323239373636342418NANANANANANA3133423424361Potato Creek State Park
Granger-Beckley St1373033373626323118232637373329202630373217331Granger-Beckley St
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
North East
Fort Wayne-Beacon St1313027363434333227292937373635233231393521351Fort Wayne-Beacon St
Leo HS1333228383436343328303139383735243232393723371Leo HS
Roanoke Elem. School1313328372829343325283138383432243133393623361Roanoke Elem. School
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
West Central
Terre Haute-Lafayette Ave1332934333633292619232735343232252635383228351Terre Haute-Lafayette Ave
West Union1353232353631303019243133343533272838413827391West Union
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
East Central
Indpls-Washington Park13527323014NANANA18242634353131222025342926331Indpls-Washington Park
Indpls-Harding St1382931323535333320272937383535222133393930371Indpls-Harding St
Indpls-Ft. Harrison1372933303435NANA21232736373433223131383427211Indpls-Ft. Harrison
Noblesville-191st St1353433273236292817243035353231233033363524331Noblesville-191st St
Indpls - I-70 E1322524212429283219262932323130191926352728321Indpls - I-70 E
Kokomo - E. Vaile Ave.1NA3133273334303319223236363232233034373529341Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
South West
Evansville-Buena Vista Rd1292827282630312622232532343538282932383531381Evansville-Buena Vista Rd
St. Philips1333331303033352923282835343741303139454038411St. Philips
AreaMonitoring SitePOCJanuary 2018POCMonitoring Site
South East
New Albany1353631323131302922323235373436293235404235371New Albany
Charlestown State Park1363130323334362927303136373535303036353832351Charlestown 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.