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Peak Daily One-Hour Ozone Averages for August 2019

The table below lists the peak daily one-hour ozone concentrations measured in August 2019 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 2019POCMonitoring Site
North West
Hammond-141st St1505670536454574548715649564636423845613149391Hammond-141st St
Ogden Dunes1475969537558714744675162615241433647543765411Ogden Dunes
Michigan City-W. Michigan Blvd1516167608862834549626069645947504456574575431Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway1535672716761674346675747705042493944514069401LaPorte-E. Lincolnway
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
North Central
South Bend-Shields Dr1545668686456784344505451536145484452574570371South Bend-Shields Dr
Potato Creek State Park1575661695159574447595138544842433539503455391Potato Creek State Park
Granger-Beckley St1525459606555814241525051485444474354564469361Granger-Beckley St
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
North East
Fort Wayne-Beacon St1526064625660555948495352505049494745524960411Fort Wayne-Beacon St
Leo HS1545965615657565749505658515250534846535363431Leo HS
Roanoke Elem. School1545562544455475544454750424544504442434151401Roanoke Elem. School
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
West Central
Terre Haute-Lafayette Ave1586365656358595053646454504745544943534347391Terre Haute-Lafayette Ave
West Union15258636657484848475564454842424042NANANANANA1West Union
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
East Central
Indpls-Washington Park1856466716564554856626250505546485047674950431Indpls-Washington Park
Indpls-Harding St1726367726259504658695747454643434743524045401Indpls-Harding St
Indpls-Ft. Harrison178626870666858535826NANANANANA515150725151471Indpls-Ft. Harrison
Noblesville-191st St1666268656564515051467055495253564849685954431Noblesville-191st St
Indpls - I-70 E1795364676149393744515847343835464846604743291Indpls - I-70 E
Kokomo - E. Vaile Ave.1526668636463524760436247545248514842504560451Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
South West
Evansville-Buena Vista Rd1616561647841535258626843484437474541523938391Evansville-Buena Vista Rd
St. Philips1566862626342495056586341504336474841534243401St. Philips
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
South East
New Albany1606764676850515948617351445044465946484554431New Albany
Charlestown State Park1566861637453525746606059455144575752625953421Charlestown 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.