Four Highest Eight-Hour Ozone Concentrations in 2019
as of August 23

Use this form to retrieve the four highest eight-hour ozone concentration averages from data collected at IDEM monitoring sites beginning December 14, 2005 through today. Although this is our most current data, it is not considered official until it has been certified by our technical staff. This information is updated hourly. All times shown are in Local Standard Time.

The table below lists the four highest daily maximum eight-hour ozone concentrations measured in 2019 in each community where the IDEM measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) The fourth-highest average is in bold black (unless it is highlighted). All ozone measurements are in parts per billion. Times are shown in 24-hour format and correspond to the beginning of the eight hour average.

Use the selection boxes below to customize this report. You may select a different year or a different report format. If you want to cut and paste data from this web page into another application, such as a spreadsheet, select the comma-delimited format. Click on the Generate Report button once you have made your selections.

Year	Report Format
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019	Tabular (Web Formatted) Comma-Delimited
Highlight with AQI colors

Area	Monitoring Site	POC	Highest			Second Highest			Third Highest			Fourth Highest
			Date	Time	Value	Date	Time	Value	Date	Time	Value	Date	Time	Value
North West
	Hammond-141st St	1	07/09/2019	1000	67	07/01/2019	1100	66	06/05/2019	1000	66	08/03/2019	1100	65
	Ogden Dunes	1	06/05/2019	1100	74	06/29/2019	1000	69	07/13/2019	1200	68	07/01/2019	1100	68
	Michigan City-W. Michigan Blvd	1	07/10/2019	1000	78	08/05/2019	1000	75	07/13/2019	1100	74	06/05/2019	1100	71
	Valparaiso	1	06/29/2019	1000	75	07/03/2019	1200	74	06/05/2019	1100	74	07/01/2019	1100	71
	Gary-IITRI	1	06/05/2019	1200	71	08/03/2019	1000	67	06/29/2019	1100	67	08/10/2019	1100	65
	LaPorte-E. Lincolnway	1	06/05/2019	1100	70	08/03/2019	1000	63	06/29/2019	1000	62	08/04/2019	0800	61
North Central
	South Bend-Shields Dr	1	07/09/2019	1200	69	07/13/2019	1100	68	06/05/2019	1200	66	06/07/2019	1200	63
	Bristol	1	06/05/2019	1200	62	06/26/2019	1100	59	07/26/2019	1200	58	05/15/2019	1200	58
	Potato Creek State Park	1	06/05/2019	1200	70	06/07/2019	1100	62	08/04/2019	0900	61	06/29/2019	1100	61
	Granger-Beckley St	1	07/09/2019	1200	66	06/05/2019	1200	66	06/07/2019	1300	61	05/15/2019	1200	61
North East
	Fort Wayne-Beacon St	1	07/09/2019	1300	65	06/29/2019	1300	64	07/01/2019	1200	63	06/27/2019	1100	63
	Leo HS	1	06/04/2019	1400	69	07/09/2019	1200	66	06/05/2019	1400	63	07/13/2019	1100	62
	Roanoke Elem. School	1	06/04/2019	1300	65	07/09/2019	1200	60	07/01/2019	1400	60	06/29/2019	1300	60
West Central
	Terre Haute-Lafayette Ave	1	06/06/2019	1300	68	08/03/2019	1100	63	07/26/2019	1000	63	07/13/2019	1200	63
	Flora	1	07/09/2019	1100	65	06/27/2019	1100	61	06/06/2019	1000	61	05/31/2019	1100	60
	Sandcut	1	06/06/2019	1300	67	04/22/2019	1200	62	06/07/2019	1100	61	06/04/2019	1200	61
	West Union	1	08/04/2019	1000	60	08/03/2019	1000	60	05/08/2019	1100	60	07/09/2019	1000	59
East Central
	Emporia	1	07/14/2019	1100	71	07/13/2019	1100	69	06/04/2019	1100	64	08/05/2019	1000	63
	Albany	1	07/13/2019	1000	61	07/10/2019	1100	60	07/27/2019	1100	59	06/04/2019	1200	59
	Indpls-Washington Park	1	08/01/2019	1200	74	07/14/2019	1000	70	08/04/2019	1000	68	08/03/2019	1000	64
	Indpls-Harding St	1	08/04/2019	1000	67	06/06/2019	1200	66	08/03/2019	1000	65	08/01/2019	1200	65
	Indpls-Ft. Harrison	1	07/14/2019	1000	73	08/01/2019	1100	70	07/13/2019	1000	67	06/27/2019	1100	67
	Monrovia	1	06/06/2019	1100	66	08/03/2019	1100	65	08/04/2019	1000	64	08/02/2019	1000	64
	Whitestown	1	08/03/2019	1000	67	07/09/2019	1100	66	06/06/2019	1000	65	08/01/2019	1100	64
	Avon	1	06/06/2019	1200	68	08/03/2019	1100	67	07/14/2019	1000	60	08/04/2019	1000	59
	Fairland	1	07/14/2019	1100	65	07/13/2019	1100	64	06/04/2019	1100	63	08/05/2019	0900	61
	Noblesville-191st St	1	06/27/2019	1200	72	08/03/2019	1000	65	08/04/2019	1100	64	07/09/2019	1200	64
	Hope	1	06/04/2019	1100	63	08/05/2019	1000	62	08/04/2019	1100	62	06/06/2019	1100	62
	Indpls - I-70 E	1	08/01/2019	1200	67	07/14/2019	0900	63	08/04/2019	0900	60	08/03/2019	1000	58
	Kokomo - E. Vaile Ave.	1	07/09/2019	1200	73	07/26/2019	1000	64	06/27/2019	1100	63	08/03/2019	1000	62
	Helmsburg	1	08/04/2019	1000	62	05/08/2019	1200	60	04/17/2019	1500	59	04/16/2019	1200	59
South West
	Boonville	1	07/13/2019	0900	68	08/05/2019	1000	63	08/11/2019	0900	62	06/01/2019	1000	61
	Evansville-Buena Vista Rd	1	07/13/2019	1000	67	08/05/2019	0900	65	08/11/2019	1000	64	06/06/2019	0900	64
	Inglefield	1	07/13/2019	0900	65	08/11/2019	0900	60	07/09/2019	1000	60	06/27/2019	1000	58
	St. Philips	1	06/06/2019	0900	64	07/13/2019	0900	63	07/25/2019	1100	61	08/02/2019	1000	60
	Leopold	1	06/29/2019	1100	64	06/01/2019	1000	64	05/17/2019	1000	63	08/08/2019	1000	61
	Dayville	1	07/13/2019	0900	67	08/05/2019	1000	63	07/09/2019	1000	60	07/12/2019	1000	59
	Plummer	1	07/13/2019	1100	66	08/11/2019	1000	63	08/05/2019	1000	63	06/28/2019	1200	62
South East
	New Albany	1	08/11/2019	1100	66	08/05/2019	1000	63	08/04/2019	1100	63	08/02/2019	1200	62
	Charlestown State Park	1	06/28/2019	1100	71	07/13/2019	1000	68	05/06/2019	1100	66	08/05/2019	1000	62
	Brownstown	1	08/04/2019	1100	64	07/13/2019	1100	60	06/29/2019	1100	60	08/03/2019	1100	58
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.

Interpreting the AQI

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

• The AQI for ozone is based on either the peak eight-hour running average since midnight OR the peak one-hour measurement since midnight.

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.