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Peak Daily One-Hour Ozone Averages for April 2017

The table below lists the peak daily one-hour ozone concentrations measured in April 2017 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 SitePOCApril 2017POCMonitoring Site
1234567891011121314151617181920212223242526272829
North West
Hammond-141st St14548304538415350524627NANANANANANANA34354244505860535835451Hammond-141st St
Ogden Dunes14447364841NANANANANA294133525651535936394345546460575540451Ogden Dunes
Michigan City-W. Michigan Blvd146484050424451556053264436555852526143394445526758615739471Michigan City-W. Michigan Blvd
Valparaiso148464248424352556052304435535852586139414346566462605535411Valparaiso
Gary-IITRI1464838504444555659512946375360NA526039384547576862575842481Gary-IITRI
LaPorte-E. Lincolnway145443347364249525951244336505452535733394244536452614736361LaPorte-E. Lincolnway
AreaMonitoring SitePOCApril 2017POCMonitoring Site
1234567891011121314151617181920212223242526272829
North Central
South Bend-Shields Dr140413139333641485648343834425047495243391829422254675039381South Bend-Shields Dr
Bristol146453244343745535945274438485348535638413746535346624636381Bristol
Potato Creek State Park147473748374249556353244839525655576041454248586254634837361Potato Creek State Park
Granger-Beckley St148473747394249556355314642505852575940434148576353665038401Granger-Beckley St
AreaMonitoring SitePOCApril 2017POCMonitoring Site
1234567891011121314151617181920212223242526272829
North East
Fort Wayne-Beacon St149524349413848575954354924NANANA595842433545555851604936371Fort Wayne-Beacon St
Leo HS150514048423948596157384940515756555945453646555949635135371Leo HS
Roanoke Elem. School149514845403947585954424836515652565836423545555648594329371Roanoke Elem. School
AreaMonitoring SitePOCApril 2017POCMonitoring Site
1234567891011121314151617181920212223242526272829
West Central
Terre Haute-Lafayette Ave150505542394147596454415261645450535752483643586864644733461Terre Haute-Lafayette Ave
Flora149515040404251566251395148525350556247473846565961635024321Flora
Sandcut149515341393946586254395061625348535651423642576762634630441Sandcut
West Union145475340394048576051345358625253485349453543576559584929461West Union
AreaMonitoring SitePOCApril 2017POCMonitoring Site
1234567891011121314151617181920212223242526272829
East Central
Indpls-E.16th St146504638443947556357405163645652506156443843566055585529491Indpls-E.16th St
Emporia145514841454147565856375061635551496055453844535649574940311Emporia
Albany146514943434149556259374955565954506056483844525752615241321Albany
Indpls-Washington Park146484738403947546053395160595451505852423841555855575331471Indpls-Washington Park
Indpls-Harding St147464738413845545751405058565350495950403340556056554329471Indpls-Harding St
Indpls-Ft. Harrison147514840443949556357385364655653515955443943555852585135431Indpls-Ft. Harrison
Monrovia146444638383639515649394754545249475245393439525651544223421Monrovia
Trafalgar147474944444146576358455163645654515955473843556057585728491Trafalgar
Whitestown147505243413847535951364857565447495846383639525759594229251Whitestown
Avon148415240434148546154364959565551505748453643555856604426451Avon
Fairland146474840434047556058425265665655506058473743526152585033511Fairland
Noblesville-191st St147494944404048566154355059625750495950423741535752604931271Noblesville-191st St
Hope144484742474047565959445264665454515949463943535850605031481Hope
Indpls - I-70 E136454132373337535851344NANANANANANANANA2832435756565122481Indpls - I-70 E
Helmsburg133NANANANA42NA596560465362615557516057473744576059594926531Helmsburg
AreaMonitoring SitePOCApril 2017POCMonitoring Site
1234567891011121314151617181920212223242526272829
South West
Boonville138454948544250576256425867635247514752463338556055484937481Boonville
Evansville-Buena Vista Rd141444847534247556053385862615143494549433437555852444434451Evansville-Buena Vista Rd
Lynnville136404544514147545852415461564942434348413137545749444736401Lynnville
Inglefield14245504654414755615539546361534443474944333755595542NANANA1Inglefield
St. Philips142435048534347556053385862575146484750453238555951454334471St. Philips
Leopold138455047613949576058495160645344514551443834515756594439441Leopold
Dayville138424646534246556054425361615243494549453235525650474737461Dayville
Plummer141494942474249596558395366625657505655453745606561654728511Plummer
AreaMonitoring SitePOCApril 2017POCMonitoring Site
1234567891011121314151617181920212223242526272829
South East
New Albany134504847564049576261505265665347495151433631426066584745501New Albany
Charlestown State Park137464847554149596061455172755243535350443731446059594745461Charlestown State Park
Brownstown141474743534049565856395058555152465747433540535858555037521Brownstown
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.