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Peak Daily One-Hour Ozone Averages for December 2019

The table below lists the peak daily one-hour ozone concentrations measured in December 2019 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 2019
1234567891011
North West
Hammond-141st St12631243126332325252622
Ogden Dunes13436273429342628252721
Michigan City-W. Michigan Blvd13339303635362831283128
Valparaiso12732273128322628252923
Gary-IITRI13435283326333427242821
LaPorte-E. Lincolnway12936273331342630262523
AreaMonitoring SitePOCDecember 2019
1234567891011
North Central
South Bend-Shields Dr12334283232332733282427
Bristol11532263232312530252327
Potato Creek State Park12635283232342833302624
Granger-Beckley St12132253131336NANANANA
AreaMonitoring SitePOCDecember 2019
1234567891011
North East
Fort Wayne-Beacon St11730313031332934273027
Leo HS11732333233343035262931
Roanoke Elem. School11635273029312729272926
AreaMonitoring SitePOCDecember 2019
1234567891011
West Central
Terre Haute-Lafayette Ave12328253025292637252922
Flora12533303132363038293328
Sandcut12731283229332940263124
West Union12932293334302938293427
AreaMonitoring SitePOCDecember 2019
1234567891011
East Central
Emporia13029273130302930293122
Albany12632293031303136312923
Indpls-Washington Park1322626323019NANANANANA
Indpls-Harding St12926253031282933292821
Indpls-Ft. Harrison12927263228323032253124
Monrovia12829293131312939322926
Whitestown13129283129342836283023
Avon12829283127302637302822
Fairland13026293130272832273026
Noblesville-191st St13429293127332833273123
Hope13128283530283134313328
Indpls - I-70 E12023232330212932232015
Kokomo - E. Vaile Ave.12631272828322831263023
Helmsburg13230313533293341343328
AreaMonitoring SitePOCDecember 2019
1234567891011
South West
Boonville13232293327303438303231
Evansville-Buena Vista Rd13134303532323141293431
Inglefield13232293134313340283330
St. Philips13234313436323241323431
Leopold13231323437323038313434
Dayville13333323531333439303332
Plummer12831303429313435313428
AreaMonitoring SitePOCDecember 2019
1234567891011
South East
New Albany13328293426253035303430
Charlestown State Park13328303627233237343529
Brownstown1NA31323735292938333630
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.