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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
North West
Hammond-141st St152694928384047465156514151515953384642541Hammond-141st St
Ogden Dunes154654631503848525455563845486150395244531Ogden Dunes
Michigan City-W. Michigan Blvd162625232564344586559564244626550415841581Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway1NA64NA285240484357616139395558NANA6043551LaPorte-E. Lincolnway
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
North Central
South Bend-Shields Dr152625441524048465460624446545751436246571South Bend-Shields Dr
Potato Creek State Park144564736483445455054623838495447405244521Potato Creek State Park
Granger-Beckley St1495849404638454149575943435123NANANANANA1Granger-Beckley St
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
North East
Fort Wayne-Beacon St152575334383847475263524547545752434745571Fort Wayne-Beacon St
Leo HS15762533639364646607NANANANANANANANANANA1Leo HS
Roanoke Elem. School148554838363645405157544447535153424246561Roanoke Elem. School
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
West Central
Terre Haute-Lafayette Ave153544939363343395757474545614748444659601Terre Haute-Lafayette Ave
West Union150464332332743445251464450564243444348481West Union
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
East Central
Indpls-E.16th St145615437372945445363524852505352444364611Indpls-E.16th St
Indpls-Washington Park151625437362745445361514852535057434161601Indpls-Washington Park
Indpls-Harding St146545232352945455759464850504650433959551Indpls-Harding St
Indpls-Ft. Harrison142635434352843425162524650505053454259631Indpls-Ft. Harrison
Noblesville-191st St148616338353047385160504551544959404149581Noblesville-191st St
Indpls - I-70 E151485137292829305252433751534056403050551Indpls - I-70 E
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
South West
Evansville-Buena Vista Rd155545136402946495760374756484137404653581Evansville-Buena Vista Rd
St. Philips153565235433147526365395057514341434855561St. Philips
AreaMonitoring SitePOCAugust 2017POCMonitoring Site
South East
New Albany157555536543336466159464660484848294862531New Albany
Charlestown State Park160557038563036485762545052535361334757691Charlestown State Park
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.