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Peak Daily One-Hour Ozone Averages for April 2019

The table below lists the peak daily one-hour ozone concentrations measured in April 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 SitePOCApril 2019POCMonitoring Site
North West
Hammond-141st St142474538305344475230384354434752501Hammond-141st St
Ogden Dunes1425651413351NA5456313644NANANA65561Ogden Dunes
Michigan City-W. Michigan Blvd147504739365348515530364551454761531Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway143495041415151555628364555405058551LaPorte-E. Lincolnway
AreaMonitoring SitePOCApril 2019POCMonitoring Site
North Central
South Bend-Shields Dr14549494548525154543729NANANA5059541South Bend-Shields Dr
Potato Creek State Park146505145515452595937364752445258581Potato Creek State Park
Granger-Beckley St144494846475150535537364552435258511Granger-Beckley St
AreaMonitoring SitePOCApril 2019POCMonitoring Site
North East
Fort Wayne-Beacon St146495146555545575240344851455159511Fort Wayne-Beacon St
Leo HS148525349575846565440365053465461511Leo HS
Roanoke Elem. School144474941515038484935314547444754521Roanoke Elem. School
AreaMonitoring SitePOCApril 2019POCMonitoring Site
West Central
Terre Haute-Lafayette Ave1NA515152495446535452525048434763631Terre Haute-Lafayette Ave
West Union145535056445546545452505048414862621West Union
AreaMonitoring SitePOCApril 2019POCMonitoring Site
East Central
Indpls-Washington Park15051505447554134NANANA4950424861571Indpls-Washington Park
Indpls-Harding St151504853395543535342504749404759551Indpls-Harding St
Indpls-Ft. Harrison137404139354324434731515152425064591Indpls-Ft. Harrison
Noblesville-191st St145515048525444525634504849424864581Noblesville-191st St
Indpls - I-70 E150494753371NANANANANA4743405060601Indpls - I-70 E
Kokomo - E. Vaile Ave.145515147465545556139514951454961591Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCApril 2019POCMonitoring Site
South West
Evansville-Buena Vista Rd143555756475442475360495247425055591Evansville-Buena Vista Rd
St. Philips147605757485443475261515047405057621St. Philips
AreaMonitoring SitePOCApril 2019POCMonitoring Site
South East
New Albany1NA515759455244475662504751484655591New Albany
Charlestown State Park146515864455243486163524752514654611Charlestown 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.