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Peak Daily One-Hour Ozone Averages for April 2018

The table below lists the peak daily one-hour ozone concentrations measured in April 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 SitePOCApril 2018POCMonitoring Site
North West
Hammond-141st St138443440374634444843465436343437NANANANANA1Hammond-141st St
Ogden Dunes14347364444494351514644604132423951465851481Ogden Dunes
Michigan City-W. Michigan Blvd14546394441484252505246564237444352476261541Michigan City-W. Michigan Blvd
LaPorte-E. Lincolnway14748374545504251515051614834394155395752501LaPorte-E. Lincolnway
AreaMonitoring SitePOCApril 2018POCMonitoring Site
North Central
South Bend-Shields Dr14549414044484049484851595136384047405354521South Bend-Shields Dr
Potato Creek State Park14825NA4549504354495253605438404150435554531Potato Creek State Park
Granger-Beckley St14748414550514150495253595138394247405554511Granger-Beckley St
AreaMonitoring SitePOCApril 2018POCMonitoring Site
North East
Fort Wayne-Beacon St14650344446474351444550605536383442405353491Fort Wayne-Beacon St
Leo HS14748344546504451464653595638394042435454491Leo HS
Roanoke Elem. School142464240424339NANANANANANA33333239275252501Roanoke Elem. School
AreaMonitoring SitePOCApril 2018POCMonitoring Site
West Central
Terre Haute-Lafayette Ave14145304748474450484950605150374257525149571Terre Haute-Lafayette Ave
West Union1424325NANANANANA484949595050384257615552591West Union
AreaMonitoring SitePOCApril 2018POCMonitoring Site
East Central
Indpls-Washington Park14345274243474547424746585246353851475252551Indpls-Washington Park
Indpls-Harding St14448304348464750444648605550373853485254591Indpls-Harding St
Indpls-Ft. Harrison146492744474847NANA4950615648364053505655591Indpls-Ft. Harrison
Noblesville-191st St14447274246464549454948635446363848455252541Noblesville-191st St
Indpls - I-70 E13646274044404248413146565349353539444244531Indpls - I-70 E
Kokomo - E. Vaile Ave.14549304247454349444647605045363844385352511Kokomo - E. Vaile Ave.
AreaMonitoring SitePOCApril 2018POCMonitoring Site
South West
Evansville-Buena Vista Rd13837324448464646494344555248353954625151601Evansville-Buena Vista Rd
St. Philips13938344549504547524547585350364155635353601St. Philips
AreaMonitoring SitePOCApril 2018POCMonitoring Site
South East
New Albany14238374447495047484246595650383859595455611New Albany
Charlestown State Park14138374449504949504547585750374061605555601Charlestown 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.