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Daily Maximum Eight-Hour Ozone Averages for February 2021

The table below lists the peak daily maximum eight-hour ozone concentrations measured in February 2021 in each community where the IDEM measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

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 with AQI colors
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
1234567891011121314151617181920212223242526
North West
Hammond-141st St139342428273027202932373220242929224032444945334036381Hammond-141st St
Ogden Dunes141373330293025303735383428283131254036515147394036411Ogden Dunes
Michigan City-W. Michigan Blvd142403633313131353534383832323130303835515148424135421Michigan City-W. Michigan Blvd
Valparaiso139333631313325353229363126252930303640525049443836401Valparaiso
Gary-IITRI140363331293124333338403524273327284137515247393836421Gary-IITRI
LaPorte-E. Lincolnway141423633303332343533383533313029303737495247424238391LaPorte-E. Lincolnway
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
1234567891011121314151617181920212223242526
North Central
South Bend-Shields Dr137383732303231333533383134313027263437425044393632351South Bend-Shields Dr
Bristol138393831323536323834373738343131303539465347443835341Bristol
Potato Creek State Park1393937333234273335343835363130NVNANANA535349474139401Potato Creek State Park
Granger-Beckley St137403932313135323734403639333129303638455144403735361Granger-Beckley St
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
1234567891011121314151617181920212223242526
North East
Fort Wayne-Beacon St1NV393832323529253833393734352931293544455248444541361Fort Wayne-Beacon St
Leo HS1394040313437333038354039353730323134NVNANA46424240361Leo HS
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
1234567891011121314151617181920212223242526
West Central
Terre Haute-Lafayette Ave13432302830302823253436312722272826NV424948433939NVNA1Terre Haute-Lafayette Ave
Flora144334034353734323941434337293332374248595252464941371Flora
Sandcut136343331323431283139393729283232344145545146413939381Sandcut
West Union140373330333532282939413631303233354447555148404140361West Union
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
1234567891011121314151617181920212223242526
East Central
Anderson-Eastside Elem. School23834352931353129343437NVNANANANANANA48514748454843382Anderson-Eastside Elem. School
Albany1373532283134NVNANA36394235403131354046525349444843361Albany
Indpls-Washington Park141343426313432263736394133292828353943464543384340351Indpls-Washington Park
Indpls-Harding St137313328293332233434373831292727323542484640374037331Indpls-Harding St
Indpls-Ft. Harrison1413436283235322939374041353029293639NVNANA44394440361Indpls-Ft. Harrison
Whitestown139303325313431263835393931262725333741454041303736331Whitestown
Avon139313828313532173534373929262829313844494744404238321Avon
Fairland139333228313333293335393834312929363744494242394037341Fairland
Noblesville-191st St140343828313631273937404136302929363945484745414540341Noblesville-191st St
Hope141373330313534284040414336333232354149504645434640371Hope
Indpls - I-70 E130231925242726201824242523222421252432444436253025341Indpls - I-70 E
Kokomo - E. Vaile Ave.141343931343732294039404137313130373947545151475044361Kokomo - E. Vaile Ave.
Helmsburg139373829323637263738424035282930363947484646434542361Helmsburg
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
1234567891011121314151617181920212223242526
South West
Boonville137353328313031272632373427272831314545484542394338321Boonville
Evansville-Buena Vista Rd13735332834313426NV3339NANANANANA32NANANANANV414540311Evansville-Buena Vista Rd
St. Philips135343028312833232833383328282530324446504342374238301St. Philips
Leopold135323531303032292934384036363128314548484943455041321Leopold
Dayville137353028323132272633393529282930314847524844414640341Dayville
Plummer136333733323634283639424430323134364452535049434342391Plummer
AreaMonitoring SitePOCFebruary 2021POCMonitoring Site
1234567891011121314151617181920212223242526
South East
New Albany138383825323237213134344136333027324046424043424741331New Albany
Charlestown State Park138383829313637273234NV4235353128353948474343454742381Charlestown State Park
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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.