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Peak Daily One-Hour Ozone Averages for December 2018

The table below lists the peak daily one-hour ozone concentrations measured in December 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 SitePOCDecember 2018POCMonitoring Site
North West
Hammond-141st St117162922272324282023172320262823301Hammond-141st St
Ogden Dunes122233835303232322931182925342824321Ogden Dunes
Michigan City-W. Michigan Blvd125294140313536343434162928333023311Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway120282733263132313229172728212423321LaPorte-E. Lincolnway
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
North Central
South Bend-Shields Dr121252534252931313129162830162828311South Bend-Shields Dr
Potato Creek State Park120302335293232323332223032153022321Potato Creek State Park
Granger-Beckley St121242633253132313229162628142629301Granger-Beckley St
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
North East
Fort Wayne-Beacon St118321929313031312928242224122129311Fort Wayne-Beacon St
Leo HS119322032313232322931252524202431331Leo HS
Roanoke Elem. School117271726323029292529222621152229301Roanoke Elem. School
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
West Central
Terre Haute-Lafayette Ave133302234372627283023343524212928251Terre Haute-Lafayette Ave
West Union129311927342427272822303420212926271West Union
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
East Central
Indpls-Washington Park129342325262233302922322726192435251Indpls-Washington Park
Indpls-Harding St127332121221728272818292724202030151Indpls-Harding St
Indpls-Ft. Harrison124291921231929282719282423182131221Indpls-Ft. Harrison
Noblesville-191st St128342029322327292825342923182534241Noblesville-191st St
Indpls - I-70 E127321818191517232013242324171626161Indpls - I-70 E
Kokomo - E. Vaile Ave.128292331312129282828272819172433291Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
South West
Evansville-Buena Vista Rd134352022322528262329333831292327311Evansville-Buena Vista Rd
St. Philips134331922312626262233344032312227301St. Philips
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
South East
New Albany127422134312927282630343533231924311New Albany
Charlestown State Park134401832332834292432353431272125301Charlestown 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.