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Daily Maximum Eight-Hour Ozone Averages for April 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2019 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 SitePOCApril 2019POCMonitoring Site
123456789101112131415161718
North West
Hammond-141st St14039413417394040462734404937414747191Hammond-141st St
Ogden Dunes14047473623NVNA47522832NVNANANA5754241Ogden Dunes
Michigan City-W. Michigan Blvd14544453627474245512834424844415151261Michigan City-W. Michigan Blvd
Valparaiso14346493927NV425049NV33445243495555311Valparaiso
Gary-IITRI1434446372547434853293543524546NV52211Gary-IITRI
LaPorte-E. Lincolnway14245463630494349522934434942455452301LaPorte-E. Lincolnway
AreaMonitoring SitePOCApril 2019POCMonitoring Site
123456789101112131415161718
North Central
South Bend-Shields Dr143464636405045494926NANANANANV5551371South Bend-Shields Dr
Bristol14145453537484047482932424739465247361Bristol
Potato Creek State Park14448483842524654543035444941485454361Potato Creek State Park
Granger-Beckley St14247473640494348503134434840475349361Granger-Beckley St
AreaMonitoring SitePOCApril 2019POCMonitoring Site
123456789101112131415161718
North East
Fort Wayne-Beacon St14446483751543749503331454839485547391Fort Wayne-Beacon St
Leo HS14649514153554052523534475141515744421Leo HS
Roanoke Elem. School14043433543473443453129424537424947361Roanoke Elem. School
AreaMonitoring SitePOCApril 2019POCMonitoring Site
123456789101112131415161718
West Central
Terre Haute-Lafayette Ave1NA49474846514351514750464739455958351Terre Haute-Lafayette Ave
Flora14546464443534249533044454842475553391Flora
Sandcut14449475047514451514651474640475960361Sandcut
West Union14249474942514252514648444538445756361West Union
AreaMonitoring SitePOCApril 2019POCMonitoring Site
123456789101112131415161718
East Central
Emporia14648484747524051523249454738475755441Emporia
Albany14042423743453443462541424032415047381Albany
Indpls-Washington Park146484650425239NANANANA444839465651371Indpls-Washington Park
Indpls-Harding St14548454936524049503646444637445650351Indpls-Harding St
Indpls-Ft. Harrison1363837363342NA41NV2748474939485954411Indpls-Ft. Harrison
Monrovia14651485145514353524151464639475859421Monrovia
Whitestown1NA4745NANA543949503347444740465654381Whitestown
Avon1NA48454644494049493447454638455655371Avon
Fairland14549494944513951523747454536455655421Fairland
Noblesville-191st St14449484647524150523147464638465952391Noblesville-191st St
Hope14548495446513749544748464938475856461Hope
Indpls - I-70 E14546364830NANANANANANA433837425554391Indpls - I-70 E
Kokomo - E. Vaile Ave.14348484537534150553146464843485853NA1Kokomo - E. Vaile Ave.
Helmsburg14550495544514051544952474937485959451Helmsburg
AreaMonitoring SitePOCApril 2019POCMonitoring Site
123456789101112131415161718
South West
Boonville14251515442503942525549434637445257371Boonville
Evansville-Buena Vista Rd14153505240493641505647444436465456351Evansville-Buena Vista Rd
Inglefield14150505138493541485347424336445356351Inglefield
St. Philips14454525342523943505749444337465659381St. Philips
Leopold14351565844494449535552444741455358451Leopold
Dayville14553475343504141515647444537465356351Dayville
Plummer145504955454838524952484445394656NANA1Plummer
AreaMonitoring SitePOCApril 2019POCMonitoring Site
123456789101112131415161718
South East
New Albany1NA48515640483943525545414640425155451New Albany
Charlestown State Park14449536041503641575648414741425256471Charlestown State Park
Brownstown14348475645523545534238373630374141321Brownstown
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.