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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
1234567891011121314151617
North West
Hammond-141st St117162922272324282023172320262823301Hammond-141st St
Ogden Dunes122233835303232322931182925342824321Ogden Dunes
Michigan City-W. Michigan Blvd125294140313536343434162928333023311Michigan City-W. Michigan Blvd
Valparaiso120283530302830313026233028303324321Valparaiso
Gary-IITRI120193124272726312827162722312722291Gary-IITRI
LaPorte-E. Lincolnway120282733263132313229172728212423321LaPorte-E. Lincolnway
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
1234567891011121314151617
North Central
South Bend-Shields Dr121252534252931313129162830162828311South Bend-Shields Dr
Bristol119252431233030NANANANA2525142029291Bristol
Potato Creek State Park120302335293232323332223032153022321Potato Creek State Park
Granger-Beckley St121242633253132313229162628142629301Granger-Beckley St
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
1234567891011121314151617
North East
Fort Wayne-Beacon St118321929313031312928242224122129311Fort Wayne-Beacon St
Leo HS119322032313232322931252524202431331Leo HS
Roanoke Elem. School117271726323029292529222621152229301Roanoke Elem. School
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
1234567891011121314151617
West Central
Terre Haute-Lafayette Ave133302234372627283023343524212928251Terre Haute-Lafayette Ave
Flora132312625312328292829282819122328311Flora
Sandcut133301825352729303125343527232929281Sandcut
West Union129311927342427272822303420212926271West Union
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
1234567891011121314151617
East Central
Emporia129341732272425312823292826252433251Emporia
Albany126361834302827262523322629202029281Albany
Indpls-Washington Park129342325262233302922322726192435251Indpls-Washington Park
Indpls-Harding St127332121221728272818292724202030151Indpls-Harding St
Indpls-Ft. Harrison124291921231929282719282423182131221Indpls-Ft. Harrison
Monrovia131342325322530272924363527202332261Monrovia
Whitestown128312525302527292726282518242930251Whitestown
Avon127332427302630282925343322192736231Avon
Fairland129NANANA302227292923353429242233241Fairland
Noblesville-191st St128342029322327292825342923182534241Noblesville-191st St
Hope130361825312234292621323326222128251Hope
Indpls - I-70 E127321818191517232013242324171626161Indpls - I-70 E
Kokomo - E. Vaile Ave.128292331312129282828272819172433291Kokomo - E. Vaile Ave.
Helmsburg130362326342633303019363628282231301Helmsburg
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
1234567891011121314151617
South West
Boonville135361923342330262631343832322227301Boonville
Evansville-Buena Vista Rd134352022322528262329333831292327311Evansville-Buena Vista Rd
Inglefield132331824312426282427343830302326301Inglefield
St. Philips134331922312626262233344032312227301St. Philips
Leopold134391924333031252833343836312022321Leopold
Dayville1353620223325242525303739322920NANA1Dayville
Plummer133331725362430293123333627332324291Plummer
AreaMonitoring SitePOCDecember 2018POCMonitoring Site
1234567891011121314151617
South East
New Albany127422134312927282630343533231924311New Albany
Charlestown State Park134401832332834292432353431272125301Charlestown State Park
Brownstown131372131352734312728353625242425341Brownstown
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.