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Peak Daily One-Hour Ozone Averages for March 2017

The table below lists the peak daily one-hour ozone concentrations measured in March 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 SitePOCMarch 2017POCMonitoring Site
1234567891011121314151617181920212223242526
North West
Hammond-141st St1353839383933434241414137NA444246333140354545374933NA1Hammond-141st St
Ogden Dunes140404235443744434340424041424244312937334546395332371Ogden Dunes
Michigan City-W. Michigan Blvd140414538484044434542444343434543393139354748435733401Michigan City-W. Michigan Blvd
Valparaiso140384136484046454341434241434350362839334645425730381Valparaiso
Gary-IITRI137404238453844444642434044444250332740344749405533381Gary-IITRI
LaPorte-E. Lincolnway136404336463742434241414038424349353037324543395429371LaPorte-E. Lincolnway
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
1234567891011121314151617181920212223242526
North Central
South Bend-Shields Dr133384036444140393436353540373742302734274239374831341South Bend-Shields Dr
Bristol136404337443943NANA39404139414247342636294542395129401Bristol
Potato Creek State Park137424537464245434441424243434451383039364747415533411Potato Creek State Park
Granger-Beckley St138424539444244454341434245434449353240324947425733411Granger-Beckley St
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
1234567891011121314151617181920212223242526
North East
Fort Wayne-Beacon St136404537474043464242444340424348312637374844415734461Fort Wayne-Beacon St
Leo HS137414639444145464343444442444449352936375045425836441Leo HS
Roanoke Elem. School136404336464143454341434437424248272639354742415446441Roanoke Elem. School
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
1234567891011121314151617181920212223242526
West Central
Terre Haute-Lafayette Ave142424246544347495342404536434450383241404844455048411Terre Haute-Lafayette Ave
Flora135353825NANA45464541424437434149323039304646445346441Flora
Sandcut141404145524346485341374338414349393040414643444949401Sandcut
West Union143424348524146495242424435414549353240454844384849371West Union
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
1234567891011121314151617181920212223242526
East Central
Indpls-E.16th St1NANANANANA3841474339424433414346373239294643455453451Indpls-E.16th St
Emporia1NA373838524240464541404335414246373035374743465653461Emporia
Albany13737NA33524343454642423933434449372835394841485852491Albany
Indpls-Washington Park136373936514242464339414232414243333138274643425251421Indpls-Washington Park
Indpls-Harding St136373737524439444636404335394045322839274542465050421Indpls-Harding St
Indpls-Ft. Harrison137373935534344474640424433424345373239294743455453441Indpls-Ft. Harrison
Monrovia138363737504340444838384133394045372639304340454845411Monrovia
Trafalgar1NANA4141554745495441424535434450413238355044495451NA1Trafalgar
Whitestown137364038524242454339414436434449353041264543405047421Whitestown
Avon140384036524544NANA39414231414249343040284642465148421Avon
Fairland141384040554445495040424432414350413138334843485555471Fairland
Noblesville-191st St1NA404037534644474641424336424348343139304843445552441Noblesville-191st St
Hope141414240554745495640404435424549403236385144475354461Hope
Indpls - I-70 E132332836504139373233304032313342312636233337404848411Indpls - I-70 E
Helmsburg1NANA4144564744505442414434424450383039395044485251451Helmsburg
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
1234567891011121314151617181920212223242526
South West
Boonville142434354524347505844444634444546413840475048404951431Boonville
Evansville-Buena Vista Rd141433954514247505742424532424449393841484947404752401Evansville-Buena Vista Rd
Lynnville1NANANANANANANANANA41394334414344383337474846394547381Lynnville
Inglefield1NANA4153524246485742424434424448413640494847404952391Inglefield
St. Philips142444353514448505844424431444549393841484848424852401St. Philips
Leopold1NANA4151554745505943414534444448403740504947475151451Leopold
Dayville141434254514147505742434529424445393841454746384848421Dayville
Plummer1NANANANANA4146515744424639454651423341515348475252431Plummer
AreaMonitoring SitePOCMarch 2017POCMonitoring Site
1234567891011121314151617181920212223242526
South East
New Albany140414245554845496044434630424549333538394942495453441New Albany
Charlestown State Park140424347564446505945444536434549393438455145515652461Charlestown State Park
Brownstown14243434454444649574439443343NANANANANANA5144455149431Brownstown
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.