Four Highest Eight-Hour Ozone Concentrations in 2019
as of February 19

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	02/18/2019	1000	40	01/13/2019	1400	39	02/16/2019	1000	37	02/12/2019	1900	35
	Ogden Dunes	1	01/19/2019	2200	37	01/13/2019	1300	37	01/21/2019	0900	35	01/20/2019	0100	35
	Michigan City-W. Michigan Blvd	1	02/18/2019	1200	40	02/16/2019	0700	40	02/12/2019	1800	40	01/20/2019	0100	40
	Valparaiso	1	02/12/2019	1800	41	02/19/2019	1100	40	02/18/2019	1000	40	02/16/2019	1000	39
	Gary-IITRI	1	01/19/2019	1600	38	01/13/2019	1200	38	01/20/2019	0100	36	01/21/2019	0900	35
	LaPorte-E. Lincolnway	1	02/18/2019	0900	40	02/19/2019	1100	39	02/16/2019	0800	37	02/12/2019	1700	37
North Central
	South Bend-Shields Dr	1	02/19/2019	1000	40	02/18/2019	1000	39	02/16/2019	0800	37	02/12/2019	2000	37
	Bristol	1	02/18/2019	1000	40	02/19/2019	1100	37	02/13/2019	1200	36	02/12/2019	1900	36
	Potato Creek State Park	1	02/19/2019	1200	44	02/18/2019	1100	42	02/12/2019	2000	40	02/13/2019	1100	39
	Granger-Beckley St	1	02/18/2019	1100	40	02/19/2019	1100	39	02/16/2019	0800	38	01/19/2019	1400	38
North East
	Fort Wayne-Beacon St	1	02/12/2019	2000	39	02/19/2019	1100	38	02/18/2019	1000	38	02/13/2019	0100	37
	Leo HS	1	02/12/2019	2000	43	02/19/2019	1100	42	02/18/2019	1100	42	02/13/2019	1100	41
	Roanoke Elem. School	1	02/18/2019	1100	37	01/20/2019	1000	37	02/13/2019	0100	36	01/19/2019	1800	36
West Central
	Terre Haute-Lafayette Ave	1	02/14/2019	1400	39	02/03/2019	1100	39	02/13/2019	0900	37	02/12/2019	2300	37
	Flora	1	02/19/2019	1200	42	02/12/2019	1800	42	02/13/2019	0100	40	02/18/2019	1000	39
	Sandcut	1	02/03/2019	1100	41	02/14/2019	1300	40	01/14/2019	1200	40	02/13/2019	0900	38
	West Union	1	02/14/2019	1100	38	02/13/2019	0800	37	02/03/2019	1000	37	01/28/2019	1900	37
East Central
	Emporia	1	02/03/2019	1300	39	02/19/2019	1000	38	02/13/2019	0100	38	02/12/2019	2300	38
	Albany	1	02/03/2019	1000	40	02/18/2019	1300	39	02/12/2019	2000	39	01/20/2019	1000	39
	Indpls-Washington Park	1	02/18/2019	1200	38	02/13/2019	0100	38	02/12/2019	2300	38	01/20/2019	0900	38
	Indpls-Harding St	1	02/19/2019	1100	41	02/14/2019	1600	38	02/13/2019	0100	34	02/12/2019	2300	34
	Indpls-Ft. Harrison	1	01/21/2019	1000	35	02/19/2019	1000	34	01/20/2019	0800	34	02/18/2019	1200	33
	Monrovia	1	02/03/2019	1100	43	02/14/2019	1400	41	01/14/2019	1100	38	02/19/2019	1100	37
	Whitestown	1	01/20/2019	0700	39	02/18/2019	1100	38	02/12/2019	2300	38	02/03/2019	1000	38
	Avon	1	02/03/2019	1100	40	02/14/2019	1200	38	02/13/2019	0100	38	02/12/2019	2300	38
	Fairland	1	02/03/2019	1300	40	02/14/2019	1600	38	02/13/2019	0100	37	02/12/2019	2300	37
	Noblesville-191st St	1	02/18/2019	1200	39	02/03/2019	1000	39	02/13/2019	0100	38	02/12/2019	2300	38
	Hope	1	02/03/2019	1100	42	02/14/2019	1600	40	02/13/2019	0800	38	01/21/2019	1000	38
	Indpls - I-70 E	1	02/03/2019	1000	34	01/21/2019	1200	34	01/19/2019	2000	33	02/19/2019	1100	31
	Kokomo - E. Vaile Ave.	1	02/19/2019	1000	40	01/29/2019	1500	39	01/20/2019	0900	38	02/03/2019	1000	37
	Helmsburg	1	02/14/2019	1400	42	02/03/2019	1100	41	02/13/2019	0900	39	02/19/2019	1100	38
South West
	Boonville	1	02/14/2019	1100	40	02/03/2019	1000	39	02/13/2019	0800	38	01/20/2019	1100	37
	Evansville-Buena Vista Rd	1	02/14/2019	1100	41	02/13/2019	0800	38	02/12/2019	2100	37	02/03/2019	1000	37
	Inglefield	1	02/14/2019	1100	41	02/03/2019	0900	38	02/13/2019	0700	36	02/12/2019	2200	36
	St. Philips	1	02/14/2019	1000	41	02/03/2019	1000	41	02/13/2019	0800	37	01/20/2019	1200	37
	Leopold	1	02/03/2019	1000	45	02/14/2019	1100	41	02/02/2019	1200	40	01/20/2019	0700	38
	Dayville	1	02/14/2019	1100	40	02/03/2019	1000	38	02/13/2019	0700	37	01/21/2019	1200	37
	Plummer	1	02/03/2019	1000	41	02/14/2019	1200	40	01/20/2019	0900	39	02/19/2019	1100	38
South East
	New Albany	1	02/03/2019	1100	39	01/20/2019	0900	38	01/30/2019	0800	37	02/19/2019	1000	36
	Charlestown State Park	1	02/03/2019	1200	43	01/20/2019	1100	39	02/19/2019	0900	38	02/15/2019	1000	37
	Brownstown	1	02/03/2019	1300	41	02/14/2019	1300	40	01/20/2019	1000	39	02/13/2019	0800	38
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.