IN.gov - Skip Navigation

Note: This message is displayed if (1) your browser is not standards-compliant or (2) you have you disabled CSS. Read our Policies for more information.

Peak Daily One-Hour Ozone Averages for August 2017

The table below lists the peak daily one-hour ozone concentrations measured in August 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 SitePOCAugust 2017POCMonitoring Site
1234567891011121314151617181920
North West
Hammond-141st St152694928384047465156514151515953384642541Hammond-141st St
Ogden Dunes154654631503848525455563845486150395244531Ogden Dunes
Michigan City-W. Michigan Blvd162625232564344586559564244626550415841581Michigan City-W. Michigan Blvd
Valparaiso144634525413848465855583837516150394843531Valparaiso
Gary-IITRI150594824423848465754554047495947394942161Gary-IITRI
LaPorte-E. Lincolnway1NA64NA285240484357616139395558NANA6043551LaPorte-E. Lincolnway
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
1234567891011121314151617181920
North Central
South Bend-Shields Dr152625441524048465460624446545751436246571South Bend-Shields Dr
Bristol150615047393844425256604245515553415844551Bristol
Potato Creek State Park144564736483445455054623838495447405244521Potato Creek State Park
Granger-Beckley St1495849404638454149575943435123NANANANANA1Granger-Beckley St
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
1234567891011121314151617181920
North East
Fort Wayne-Beacon St152575334383847475263524547545752434745571Fort Wayne-Beacon St
Leo HS15762533639364646607NANANANANANANANANANA1Leo HS
Roanoke Elem. School148554838363645405157544447535153424246561Roanoke Elem. School
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
1234567891011121314151617181920
West Central
Terre Haute-Lafayette Ave153544939363343395757474545614748444659601Terre Haute-Lafayette Ave
Flora151565044333242374659464544534655433844561Flora
Sandcut154544739333139375558464344534747434453571Sandcut
West Union150464332332743445251464450564243444348481West Union
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
1234567891011121314151617181920
East Central
Indpls-E.16th St145615437372945445363524852505352444364611Indpls-E.16th St
Emporia143585134353341405165604348475351454351611Emporia
Albany146585333333038374757484046534552423744551Albany
Indpls-Washington Park151625437362745445361514852535057434161601Indpls-Washington Park
Indpls-Harding St146545232352945455759464850504650433959551Indpls-Harding St
Indpls-Ft. Harrison142635434352843425162524650505053454259631Indpls-Ft. Harrison
Monrovia140495137322445494754494641464241433953511Monrovia
Trafalgar139485236332745425356444943464445414053531Trafalgar
Whitestown147454635322737365452444350484653424150551Whitestown
Avon1464857383630424157564648465125NANANANANA1Avon
Fairland145535434373042415373494950475350454466561Fairland
Noblesville-191st St148616338353047385160504551544959404149581Noblesville-191st St
Hope145595934362540436362515144544750394155541Hope
Indpls - I-70 E151485137292829305252433751534056403050551Indpls - I-70 E
Helmsburg142515336362448465857505143484542464352551Helmsburg
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
1234567891011121314151617181920
South West
Boonville159585335463243465566455359514536434658571Boonville
Evansville-Buena Vista Rd155545136402946495760374756484137404653581Evansville-Buena Vista Rd
Lynnville155514733402842435261384453473937394356561Lynnville
Inglefield156535137443047475164384857473839414655551Inglefield
St. Philips153565235433147526365395057514341434855561St. Philips
Leopold152685338323338426361434652434746415264531Leopold
Dayville15253523542314743NANANANANANANANANANANANA1Dayville
Plummer156555734372844495461484546574844414757511Plummer
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
1234567891011121314151617181920
South East
New Albany157555536543336466159464660484848294862531New Albany
Charlestown State Park160557038563036485762545052535361334757691Charlestown State Park
Brownstown1495666353825414756574750484544434510NANA1Brownstown
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.