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Peak Daily One-Hour Ozone Averages for August 2018

The table below lists the peak daily one-hour ozone concentrations measured in August 2018 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 2018POCMonitoring Site
North West
Hammond-141st St15347625148485537484441434050333852361Hammond-141st St
Ogden Dunes16055675653556340625448504959354472381Ogden Dunes
Michigan City-W. Michigan Blvd18159717555556240815248514865374673411Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway15453675453464738565144464558354860381LaPorte-E. Lincolnway
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
North Central
South Bend-Shields Dr16453676757465844605645454564394153401South Bend-Shields Dr
Potato Creek State Park15648675544415238445548394657304148411Potato Creek State Park
Granger-Beckley St16351646755455340614841434359383648361Granger-Beckley St
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
North East
Fort Wayne-Beacon St15357495951494243485741434852343245391Fort Wayne-Beacon St
Leo HS15354556355534748515245455151363445381Leo HS
Roanoke Elem. School14746424943473739464347385347293239391Roanoke Elem. School
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
West Central
Terre Haute-Lafayette Ave15450535650434646514944504353273039441Terre Haute-Lafayette Ave
West Union15042464638383842444445464947253038431West Union
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
East Central
Indpls-Washington Park16057586357424247535342454753233038461Indpls-Washington Park
Indpls-Harding St16152525558404146525243494948222835501Indpls-Harding St
Indpls-Ft. Harrison15060606956434048535538434455242940431Indpls-Ft. Harrison
Noblesville-191st St14760616053534145515840414454263149421Noblesville-191st St
Indpls - I-70 E15852525953403841454433373639253137371Indpls - I-70 E
Kokomo - E. Vaile Ave.1NA52495046424443464844394152253245361Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
South West
Evansville-Buena Vista Rd15561575747394141475754465057273846461Evansville-Buena Vista Rd
St. Philips15247494743424142435749445053274149471St. Philips
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
South East
New Albany14374575948405050485252434654293441441New Albany
Charlestown State Park14457617372446148517053404661283843431Charlestown 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.