Daily Maximum Eight-Hour Ozone Averages for April 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in April 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.) All ozone measurements are in parts per billion.

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Month:	Year:	Report Format:	Include time:
			Include time
Highlight with AQI colors

Area	Monitoring Site	POC	April 2019																		POC	Monitoring Site
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	POC	Monitoring Site
North West
	Hammond-141st St	1	40	39	41	34	17	39	40	40	46	27	34	40	49	37	41	47	47	19	1	Hammond-141st St
	Ogden Dunes	1	40	47	47	36	23	NV	NA	47	52	28	32	NV	NA	NA	NA	57	54	24	1	Ogden Dunes
	Michigan City-W. Michigan Blvd	1	45	44	45	36	27	47	42	45	51	28	34	42	48	44	41	51	51	26	1	Michigan City-W. Michigan Blvd
	Valparaiso	1	43	46	49	39	27	NV	42	50	49	NV	33	44	52	43	49	55	55	31	1	Valparaiso
	Gary-IITRI	1	43	44	46	37	25	47	43	48	53	29	35	43	52	45	46	NV	52	21	1	Gary-IITRI
	LaPorte-E. Lincolnway	1	42	45	46	36	30	49	43	49	52	29	34	43	49	42	45	54	52	30	1	LaPorte-E. Lincolnway


Area	Monitoring Site	POC	April 2019																		POC	Monitoring Site
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	POC	Monitoring Site
North Central
	South Bend-Shields Dr	1	43	46	46	36	40	50	45	49	49	26	NA	NA	NA	NA	NV	55	51	37	1	South Bend-Shields Dr
	Bristol	1	41	45	45	35	37	48	40	47	48	29	32	42	47	39	46	52	47	36	1	Bristol
	Potato Creek State Park	1	44	48	48	38	42	52	46	54	54	30	35	44	49	41	48	54	54	36	1	Potato Creek State Park
	Granger-Beckley St	1	42	47	47	36	40	49	43	48	50	31	34	43	48	40	47	53	49	36	1	Granger-Beckley St


Area	Monitoring Site	POC	April 2019																		POC	Monitoring Site
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	POC	Monitoring Site
North East
	Fort Wayne-Beacon St	1	44	46	48	37	51	54	37	49	50	33	31	45	48	39	48	55	47	39	1	Fort Wayne-Beacon St
	Leo HS	1	46	49	51	41	53	55	40	52	52	35	34	47	51	41	51	57	44	42	1	Leo HS
	Roanoke Elem. School	1	40	43	43	35	43	47	34	43	45	31	29	42	45	37	42	49	47	36	1	Roanoke Elem. School


Area	Monitoring Site	POC	April 2019																		POC	Monitoring Site
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	POC	Monitoring Site
West Central
	Terre Haute-Lafayette Ave	1	NA	49	47	48	46	51	43	51	51	47	50	46	47	39	45	59	58	35	1	Terre Haute-Lafayette Ave
	Flora	1	45	46	46	44	43	53	42	49	53	30	44	45	48	42	47	55	53	39	1	Flora
	Sandcut	1	44	49	47	50	47	51	44	51	51	46	51	47	46	40	47	59	60	36	1	Sandcut
	West Union	1	42	49	47	49	42	51	42	52	51	46	48	44	45	38	44	57	56	36	1	West Union


Area	Monitoring Site	POC	April 2019																		POC	Monitoring Site
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	POC	Monitoring Site
East Central
	Emporia	1	46	48	48	47	47	52	40	51	52	32	49	45	47	38	47	57	55	44	1	Emporia
	Albany	1	40	42	42	37	43	45	34	43	46	25	41	42	40	32	41	50	47	38	1	Albany
	Indpls-Washington Park	1	46	48	46	50	42	52	39	NA	NA	NA	NA	44	48	39	46	56	51	37	1	Indpls-Washington Park
	Indpls-Harding St	1	45	48	45	49	36	52	40	49	50	36	46	44	46	37	44	56	50	35	1	Indpls-Harding St
	Indpls-Ft. Harrison	1	36	38	37	36	33	42	NA	41	NV	27	48	47	49	39	48	59	54	41	1	Indpls-Ft. Harrison
	Monrovia	1	46	51	48	51	45	51	43	53	52	41	51	46	46	39	47	58	59	42	1	Monrovia
	Whitestown	1	NA	47	45	NA	NA	54	39	49	50	33	47	44	47	40	46	56	54	38	1	Whitestown
	Avon	1	NA	48	45	46	44	49	40	49	49	34	47	45	46	38	45	56	55	37	1	Avon
	Fairland	1	45	49	49	49	44	51	39	51	52	37	47	45	45	36	45	56	55	42	1	Fairland
	Noblesville-191st St	1	44	49	48	46	47	52	41	50	52	31	47	46	46	38	46	59	52	39	1	Noblesville-191st St
	Hope	1	45	48	49	54	46	51	37	49	54	47	48	46	49	38	47	58	56	46	1	Hope
	Indpls - I-70 E	1	45	46	36	48	30	NA	NA	NA	NA	NA	NA	43	38	37	42	55	54	39	1	Indpls - I-70 E
	Kokomo - E. Vaile Ave.	1	43	48	48	45	37	53	41	50	55	31	46	46	48	43	48	58	53	NA	1	Kokomo - E. Vaile Ave.
	Helmsburg	1	45	50	49	55	44	51	40	51	54	49	52	47	49	37	48	59	59	45	1	Helmsburg


Area	Monitoring Site	POC	April 2019																		POC	Monitoring Site
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	POC	Monitoring Site
South West
	Boonville	1	42	51	51	54	42	50	39	42	52	55	49	43	46	37	44	52	57	37	1	Boonville
	Evansville-Buena Vista Rd	1	41	53	50	52	40	49	36	41	50	56	47	44	44	36	46	54	56	35	1	Evansville-Buena Vista Rd
	Inglefield	1	41	50	50	51	38	49	35	41	48	53	47	42	43	36	44	53	56	35	1	Inglefield
	St. Philips	1	44	54	52	53	42	52	39	43	50	57	49	44	43	37	46	56	59	38	1	St. Philips
	Leopold	1	43	51	56	58	44	49	44	49	53	55	52	44	47	41	45	53	58	45	1	Leopold
	Dayville	1	45	53	47	53	43	50	41	41	51	56	47	44	45	37	46	53	56	35	1	Dayville
	Plummer	1	45	50	49	55	45	48	38	52	49	52	48	44	45	39	46	56	NA	NA	1	Plummer


Area	Monitoring Site	POC	April 2019																		POC	Monitoring Site
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	POC	Monitoring Site
South East
	New Albany	1	NA	48	51	56	40	48	39	43	52	55	45	41	46	40	42	51	55	45	1	New Albany
	Charlestown State Park	1	44	49	53	60	41	50	36	41	57	56	48	41	47	41	42	52	56	47	1	Charlestown State Park
	Brownstown	1	43	48	47	56	45	52	35	45	53	42	38	37	36	30	37	41	41	32	1	Brownstown


POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).
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

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.

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Indiana Department of Environmental Management

Daily Maximum Eight-Hour Ozone Averages for April 2019

Interpreting the AQI