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Peak Daily One-Hour Ozone Averages for February 2021

The table below lists the peak daily one-hour ozone concentrations measured in February 2021 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 SitePOCFebruary 2021POCMonitoring Site
12345678910111213141516171819202122232425
North West
Hammond-141st St1413733302933312838373935222631382146365453493847411Hammond-141st St
Ogden Dunes1434037353142273339393936302933353144395753514446421Ogden Dunes
Michigan City-W. Michigan Blvd1434339383233333739353939363433323641395555514845431Michigan City-W. Michigan Blvd
Valparaiso1414039373335273736343835282831343340425653515044391Valparaiso
Gary-IITRI1443938353234283536414237262934362947385654524446421Gary-IITRI
LaPorte-E. Lincolnway1434341383235353638374037383332323540405354504648441LaPorte-E. Lincolnway
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
12345678910111213141516171819202122232425
North Central
South Bend-Shields Dr1394042373235343637353934373232302937394651474441381South Bend-Shields Dr
Bristol1414142353437373540363941413532343538435255514842411Bristol
Potato Creek State Park14041434034363235383839394133323126NANA5555535147441Potato Creek State Park
Granger-Beckley St1414242353332363539364139413432323139425053494442411Granger-Beckley St
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
12345678910111213141516171819202122232425
North East
Fort Wayne-Beacon St1404141333436322742364141363831343338474854495049441Fort Wayne-Beacon St
Leo HS14143443337393632433843413740323632364841NA474744451Leo HS
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
12345678910111213141516171819202122232425
West Central
Terre Haute-Lafayette Ave1363635293231302629363835292629313044455450464242291Terre Haute-Lafayette Ave
Flora1464145373639383343454648433134354445526256544952461Flora
Sandcut1393636323435323233414142313233353747495854494442421Sandcut
West Union1424037323537342935424238333234373950525854514444431West Union
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
12345678910111213141516171819202122232425
East Central
Anderson-Eastside Elem. School240394031293633323636383934NANANANANA505549504850452Anderson-Eastside Elem. School
Albany13939362930363126NA394244394532373843495556524851461Albany
Indpls-Washington Park1424039293136352940374144373329313641475147454247431Indpls-Washington Park
Indpls-Harding St1413840292936353037353942363328313637455251454246401Indpls-Harding St
Indpls-Ft. Harrison14340393031373531413842453934303138444742NA464247431Indpls-Ft. Harrison
Whitestown1423440273136322840384043352828273539454943433541391Whitestown
Avon1433442303237342539363944343129323341475251484446401Avon
Fairland1413936313335353235384143363430324039485144434143411Fairland
Noblesville-191st St1433942293037333042394144393330313843475052484447421Noblesville-191st St
Hope1434236323238353141414346393634333944535348474752441Hope
Indpls - I-70 E1322924282430292520282729272525253127355047423234281Indpls - I-70 E
Kokomo - E. Vaile Ave.1444146333439363144424144403332334142496156535353461Kokomo - E. Vaile Ave.
Helmsburg1423942323338392836404443393130324043485148484649441Helmsburg
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
12345678910111213141516171819202122232425
South West
Boonville1383737313432322926343837293030333347485247454447391Boonville
Evansville-Buena Vista Rd1393835304133373029374639NANANANA3530NANANA424550421Evansville-Buena Vista Rd
St. Philips1373632313430352831364135293129323447495545454147411St. Philips
Leopold1383437343233343231363942414034313348515150464754441Leopold
Dayville1393839313532333026354038313231343351505751474651421Dayville
Plummer1393640353337363234404447333533353949565752554647451Plummer
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
12345678910111213141516171819202122232425
South East
New Albany1403940303436393032343743433533283444494641454651441New Albany
Charlestown State Park1404040323537383033333744433834303743515048454752451Charlestown 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.