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Peak Daily One-Hour Ozone Averages for October 2017

The table below lists the peak daily one-hour ozone concentrations measured in October 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 SitePOCOctober 2017POCMonitoring Site
12345678910111213141516171819202122
North West
Hammond-141st St1425636283427424655322215322834333848415441471Hammond-141st St
Ogden Dunes1415738353828434846382318403237384249476545451Ogden Dunes
Michigan City-W. Michigan Blvd141544335372942424738232139333733404942NANANA1Michigan City-W. Michigan Blvd
Valparaiso1425438254231424653352118393032364350426242371Valparaiso
Gary-IITRI1405635333725414548352316352835354045445842451Gary-IITRI
LaPorte-E. Lincolnway1415739264328434252402322393533364147446245371LaPorte-E. Lincolnway
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
12345678910111213141516171819202122
North Central
South Bend-Shields Dr1435644324830454354392525413532354248436249381South Bend-Shields Dr
Bristol1435542325529424055292324413432334247455950391Bristol
Potato Creek State Park1415844275228444153432323403430364046466249NA1Potato Creek State Park
Granger-Beckley St1NANANA284827444256382427403532344146445849381Granger-Beckley St
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
12345678910111213141516171819202122
North East
Fort Wayne-Beacon St1445749354634403742392119425134344346526054421Fort Wayne-Beacon St
Leo HS1435749384731433842NA1921434735334447516154421Leo HS
Roanoke Elem. School1445551344035403839382919465334354449516251421Roanoke Elem. School
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
12345678910111213141516171819202122
West Central
Terre Haute-Lafayette Ave1495744434254463334411425535734384651575848411Terre Haute-Lafayette Ave
Sandcut1465444403950443332401622505534364549555546411Sandcut
West Union1515640433754372837401626475334384550565848411West Union
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
12345678910111213141516171819202122
East Central
Indpls-E.16th St1455646343644383125291915424532354143495549441Indpls-E.16th St
Emporia147554844384948363242237NANANA374247585950431Emporia
Albany1425348443634403237272012424732334246545753411Albany
Indpls-Washington Park1455546313441433225252014444631374043515351441Indpls-Washington Park
Indpls-Harding St1465445313044403127252218424134343941515152421Indpls-Harding St
Indpls-Ft. Harrison1475748343845453226332018464832384345555753461Indpls-Ft. Harrison
Monrovia1434745363545423026271916394432344243505244381Monrovia
Trafalgar14559474037534629NA242320404532384447545447421Trafalgar
Whitestown1495341382844403527371916445031364245515649371Whitestown
Avon14350463533454331261NANANANANANANANANANANANA1Avon
Fairland1485547453755443331302024515134394547566151471Fairland
Noblesville-191st St1465550403947453530372116485335384548576153461Noblesville-191st St
Hope1445348434055382825271919445130394647545849461Hope
Indpls - I-70 E1455445313143403126282114424631253942405350431Indpls - I-70 E
Helmsburg1445648363856382525252419414732384446555547411Helmsburg
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
12345678910111213141516171819202122
South West
Boonville1474646545460423039181727504733364451495748401Boonville
Evansville-Buena Vista Rd14646425350563427331916264344343743454651NANA1Evansville-Buena Vista Rd
Lynnville1444246524956382132211428454330353847495245361Lynnville
Inglefield1464644565258372637191723464536384237485248391Inglefield
St. Philips1514844565559392835212127495037404345515447401St. Philips
Leopold1484346564959372928241925414732374247515245401Leopold
Dayville1464546585260372832231627504534374551505548391Dayville
Plummer1464952524762492319361728444933384649555645401Plummer
AreaMonitoring SitePOCOctober 2017POCMonitoring Site
12345678910111213141516171819202122
South East
New Albany1545250524855313018172027454837374340525745401New Albany
Charlestown State Park1515263565462363020252124505439404244546152411Charlestown State Park
Brownstown1485942554459342524242125434632394544535647401Brownstown
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.