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Daily Maximum Eight-Hour Ozone Averages for April 2017

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 2017 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 2017POCMonitoring Site
123456789101112131415161718192021222324252627282930
North West
Hammond-141st St13939223838404747504023NANANANANANANA3032404147435649333841231Hammond-141st St
Ogden Dunes14242254137NANANANANA25362948534745553335424351545752354142201Ogden Dunes
Michigan City-W. Michigan Blvd14244314240424753584721413451554846573535434449625656384142291Michigan City-W. Michigan Blvd
Valparaiso143442943404146525847273932515548505630364143536158NV363739301Valparaiso
Gary-IITRI1454326404142505256452443325056NA45563735444555595954364345261Gary-IITRI
LaPorte-E. Lincolnway14340264237404649574519383246524550552735384250595055323233281LaPorte-E. Lincolnway
AreaMonitoring SitePOCApril 2017POCMonitoring Site
123456789101112131415161718192021222324252627282930
North Central
South Bend-Shields Dr13838253531353946534317353239484344503130162031NVNV61373736321South Bend-Shields Dr
Bristol14441274034364349564221403643494348523036344349524355353434281Bristol
Potato Creek State Park14646324537404753604922423649544654583140384554605158363633311Potato Creek State Park
Granger-Beckley St14644304437404752604924434046564752563239384554595060363738331Granger-Beckley St
AreaMonitoring SitePOCApril 2017POCMonitoring Site
123456789101112131415161718192021222324252627282930
North East
Fort Wayne-Beacon St1474740413835465356502945NANANANANV563839334251544556442633291Fort Wayne-Beacon St
Leo HS14747384339374654585231453846565352553943344351554558452834301Leo HS
Roanoke Elem. School14547374137384554565029443445524851542638334249534553412434291Roanoke Elem. School
AreaMonitoring SitePOCApril 2017POCMonitoring Site
123456789101112131415161718192021222324252627282930
West Central
Terre Haute-Lafayette Ave14645463734394554604931465758534847544842344155636056302539301Terre Haute-Lafayette Ave
Flora14648403837404652594832463942514751574041364352575656352030281Flora
Sandcut14648463535384353594930455757524649534739344054635855302539291Sandcut
West Union14141463835394552584829465453514744504641334055605653252439331West Union
AreaMonitoring SitePOCApril 2017POCMonitoring Site
123456789101112131415161718192021222324252627282930
East Central
Indpls-E.16th St14348443738384452595332485654544947565041354053575153392431221Indpls-E.16th St
Emporia14247423740394553565332465059534847555042354050544654453225241Emporia
Albany14248403438NV4753585434444749564946564845353949544756483029231Albany
Indpls-Washington Park14345403837384451574932485451514946534636343952565051372429201Indpls-Washington Park
Indpls-Harding St143424137363640505348NV455346524747554535313752575249332133201Indpls-Harding St
Indpls-Ft. Harrison14347433840384652595233475756545049554939354053565052402827221Indpls-Ft. Harrison
Monrovia14241433434343749554829425151494644494235313749544849332134181Monrovia
Trafalgar14244463841384354615635465959535148565144354153575455412544221Trafalgar
Whitestown144474337373843505747304450505043465241353237495556523526NANA1Whitestown
Avon14339453635384352595131445650524846544539344053555254352130181Avon
Fairland14144453740394353585633466063545046565243344050575053442944221Fairland
Noblesville-191st St14346433837394552595131455056544746544638343851554853402725201Noblesville-191st St
Hope13942443942384353585636475960534948544642364051554755442643211Hope
Indpls - I-70 E13343383133313249554620NANANANANANANANANA252840515250371527201Indpls - I-70 E
Helmsburg1NANANANANANVNA566259NA476059545249575244344255585755372143171Helmsburg
AreaMonitoring SitePOCApril 2017POCMonitoring Site
123456789101112131415161718192021222324252627282930
South West
Boonville13642454650394754605435525955514143444643283652555047284144341Boonville
Evansville-Buena Vista Rd13940444448404553585132525855503938424340283750544642233443311Evansville-Buena Vista Rd
Lynnville13437414146384450575030465551473636394438273349524643243037271Lynnville
Inglefield139424643483844536053275058575139384345423036525548NVNANANANA1Inglefield
St. Philips13940464448414552585132505753504038444541283651564743253443311St. Philips
Leopold13741474654384755585737495959523747424641303348545055323740281Leopold
Dayville13639424448394451565230485652503942414341273449524542263842321Dayville
Plummer13845464041414755625534506157544948524941344357625756322346281Plummer
AreaMonitoring SitePOCApril 2017POCMonitoring Site
123456789101112131415161718192021222324252627282930
South East
New Albany13343454448394653585938466059523744474340312740545554393641131New Albany
Charlestown State Park13343454549384654576038NV646751384748454034NV425352564338NV281Charlestown State Park
Brownstown13742434145394653565436455452494444534338323850555452373142181Brownstown
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.