Daily Maximum Eight-Hour Ozone Averages for May 2021

The table below lists the peak daily maximum eight-hour ozone concentrations measured in May 2021 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	May 2021
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8
North West
	Hammond-141st St	1	56	47	30	26	30	38	42	33
	Ogden Dunes	1	53	46	30	28	33	38	42	35
	Michigan City-W. Michigan Blvd	1	55	49	34	29	33	37	42	35
	Valparaiso	1	53	46	31	25	34	34	41	31
	Gary-IITRI	1	53	46	28	27	NV	NA	NA	NA
	LaPorte-E. Lincolnway	1	53	47	31	27	32	29	41	30


Area	Monitoring Site	POC	May 2021
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8
North Central
	South Bend-Shields Dr	1	53	48	32	27	32	25	41	27
	Bristol	1	51	48	32	27	32	21	39	23
	Potato Creek State Park	1	53	48	31	27	32	24	41	27
	Granger-Beckley St	1	57	52	34	28	34	24	42	29


Area	Monitoring Site	POC	May 2021
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8
North East
	Fort Wayne-Beacon St	1	48	47	28	29	33	31	40	27
	Leo HS	1	53	52	32	31	35	34	44	23


Area	Monitoring Site	POC	May 2021
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8
West Central
	Terre Haute-Lafayette Ave	1	53	43	30	23	37	34	47	24
	Flora	1	53	48	36	30	36	33	49	30
	Sandcut	1	54	43	31	25	39	34	48	28
	West Union	1	53	43	33	24	39	39	49	32


Area	Monitoring Site	POC	May 2021
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8
East Central
	Anderson-Eastside Elem. School	2	53	52	36	31	35	41	49	30
	Albany	1	51	52	36	32	35	38	47	29
	Indpls-Washington Park	1	50	46	32	26	36	39	45	28
	Indpls-Harding St	1	51	45	29	22	34	37	43	24
	Indpls-Ft. Harrison	1	54	NV	NA	28	37	42	48	25
	Whitestown	1	51	46	32	28	37	39	46	30
	Avon	1	53	45	32	25	36	40	44	28
	Fairland	1	49	43	31	23	34	41	46	28
	Noblesville-191st St	1	55	50	35	30	36	40	NV	NA
	Hope	1	51	NV	NA	30	39	NV	NA	NA
	Indpls - I-70 E	1	48	41	NV	20	NV	NA	NA	NA
	Kokomo - E. Vaile Ave.	1	54	50	36	31	35	34	50	30
	Helmsburg	1	55	47	33	24	40	40	47	25


Area	Monitoring Site	POC	May 2021
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8
South West
	Boonville	1	50	39	36	32	40	41	49	32
	Evansville-Buena Vista Rd	1	50	39	35	28	38	38	47	32
	Inglefield	1	52	37	38	29	38	40	48	33
	St. Philips	1	47	34	36	26	36	38	47	32
	Leopold	1	55	44	40	40	40	44	49	34
	Dayville	1	50	40	38	34	39	41	50	32
	Plummer	1	56	43	36	27	39	41	49	31


Area	Monitoring Site	POC	May 2021
Area	Monitoring Site	POC	1	2	3	4	5	6	7	8
South East
	New Albany	1	50	42	40	42	39	44	49	30
	Charlestown State Park	1	50	42	39	41	38	43	47	31


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 May 2021

Interpreting the AQI