Maximum Ozone Concentrations & Number of Days Exceeding Standards

Home I Search I A - Z Index I Contact Us

Please email us if you encounter information in this website for which you know there is an update or correction. Thank You!

L.A. Maps Online

Click on Map Above

Maximum Ozone Concentrations & Number of Days Exceeding Standards
By Area within Los Angeles County
1995 - 2000

2000

Year	Area	No. Days of Data	Maximum Concentration in ppm 1-hour	Maximum Concentration in ppm 8-hour	No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.	No. Days Standard Exceeded – Federal >0.08 ppm 8-hr.	No. Days Standard Exceeded – State >0.09 ppm 1-hr
2000	Central LA	365	0.14	0.105	1	4	8
2000	Northwest Coastal LA County	365	0.10	0.079	0	0	2
2000	Southwest Coastal LA County	359	0.10	0.075	0	0	1
2000	South Coastal LA County	365	0.12	0.080	0	0	3
2000	West San Fernando Valley	362	0.11	0.084	0	0	6
2000	East San Fernando Valley	363	0.15	0.119	3	11	16
2000	West San Gabriel Valley	362	0.16	0.134	7	14	19
2000	East San Gabriel Valley 1	365	0.17	0.141	11	16	32
2000	East San Gabriel Valley 2	358	0.17	0.148	11	22	39
2000	Pomona/Walnut	363	0.15	0.124	3	5	18
2000	South San Gabriel Valley	365	0.14	0.114	2	4	11
2000	South Central LA County 1	365	0.09	0.064	0	0	0
2000	South Central LA County 2	222*	0.12*	0.095*	0*	4*	4*
2000	Santa Clarita Valley	360	0.13	0.111	1	16	31

1999

Year	Area	No. Days of Data	Maximum Concentration in ppm 1-hour	Maximum Concentration in ppm 8-hour	No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.	No. Days Standard Exceeded – Federal >0.08 ppm 8-hr.	No. Days Standard Exceeded – State >0.09 ppm 1-hr
1999	Central LA	362	0.13	0.11	1	2	13
1999	Northwest Coastal LA County	365	0.12	0.08	0	0	4
1999	Southwest Coastal LA County	362	0.15	0.09	1	1	1
1999	South Coastal LA County	362	0.13	0.08	1	0	3
1999	West San Fernando Valley	365	0.1	0.09	0	1	5
1999	East San Fernando Valley	362	0.12	0.1	0	3	13
1999	West San Gabriel Valley	361	0.12	0.1	0	4	15
1999	East San Gabriel Valley 1	339*	0.14*	0.10*	2*	9*	24*
1999	East San Gabriel Valley 2	362	0.14	0.11	3	8	25
1999	Pomona/Walnut Valley 1	358	0.14	0.1	2	10	19
1999	South San Gabriel Valley	363	0.12	0.1	0	2	6
1999	South Central LA County	363	0.12	0.06	0	0	1
1999	South Central LA County	342*	0.16*	0.09*	1*	2*	6*
1999	Santa Clarita Valley	357	0.12	0.1	0	13	18

1998

Year	Area	No. Days of Data	Maximum Concentration in ppm 1-hour	Maximum Concentration in ppm 8-hour	No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.	No. Days Standard Exceeded – Federal >0.08 ppm 8-hr.	No. Days Standard Exceeded – State >0.09 ppm 1-hr
1998	Central LA	362	0.15	0.11	5	9	17
1998	Northwest Coastal LA County	365	0.13	0.08	1	0	7
1998	Southwest Coastal LA County	363	0.09	0.07	0	0	0
1998	South Coastal LA County	361	0.12	0.08	0	0	2
1998	West San Fernando Valley	365	0.16	0.12	7	13	23
1998	East San Fernando Valley	355	0.18	0.13	7	14	34
1998	West San Gabriel Valley	349	0.17	0.14	14	17	31
1998	East San Gabriel Valley 1	352	0.20	0.15	19	23	43
1998	East San Gabriel Valley 2	352	0.22	0.17	28	38	61
1998	Pomona/Walnut Valley 1	365	0.18	0.13	18	21	41
1998	South San Gabriel Valley	364	0.18	0.12	10	13	31
1998	South Central LA County	361	0.09	0.06	0	0	0
1998	South Central LA County	160*	0.13*	0.10*	1*	4*	7*
1998	Santa Clarita Valley	352	0.18	0.15	16	35	38

1997

Year	Area	No. Days of Data	Maximum Concentration in ppm 1-hour	Maximum Concentration in ppm 8-hour	No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.	No. Days Standard Exceeded – Federal >0.08 ppm 8-hr.	No. Days Standard Exceeded – State >0.09 ppm 1-hr
1997	Central LA	365	0.12	0.09	0	3	6
1997	North West Coast LA County	365	0.11	0.09	0	2	6
1997	South West Coast LA County	364	0.11	0.09	0	3	6
1997	South Coast LA County	365	0.10	0.07	0	0	1
1997	West San Fernando Valley	365	0.12	0.10	0	3	12
1997	East San Fernando Valley	355	0.13	0.11	2	6	15
1997	West San Gabriel Valley	365	0.14	0.11	5	16	24
1997	East San Gabriel Valley (1)	357	0.16	0.12	11	18	42
1997	East San Gabriel Valley (2)	365	0.17	0.13	18	26	67
1997	Pomona/Walnut Valley (1)	364	0.16	0.12	7	10	30
1997	Pomona/Walnut Valley (2)	--	--	--	--	--	--
1997	South San Gabriel Valley	355	0.13	0.10	6	7	18
1997	South Central LA County	359	0.08	0.07	0	0	0
1997	Santa Clarita Valley	365	0.16	0.13	13	27	54

1996

Year	Area	No. Days of Data	Maximum Concentration in ppm 1-hour	2nd High Concentration ppm 1-hour	No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.	No. Days Standard Exceeded – State >0.09 ppm 1-hr
1996	Central LA	366	.14	.14	4	24
1996	North West Coast LA County	357	.14	.12	1	13
1996	South West Coast LA County	366	.13	.12	1	8
1996	South Coast LA County	264*	.11*	.10*	0*	5*
1996	West San Fernando Valley	366	.21	.16	11	50
1996	East San Fernando Valley	366	.14	.14	6	31
1996	West San Gabriel Valley	366	.17	.16	17	54
1996	East San Gabriel Valley 1	366	.20	.18	26	74
1996	East San Gabriel Valley 2	366	.21	.20	49	91
1996	Pomona/Walnut Valley 1	364	.19	.18	16	44
1996	Pomona/Walnut Valley 2	135*	.18*	.14*	2*	7*
1996	South San Gabriel Valley	366	.14	.14	9	32
1996	South Central LA County	360	.10	.09	0	1
1996	Santa Clarita Valley	366	.17	.15	19	68
1996	Antelope Valley	366	.13	.12	1	40

*Less than 12 full months of data. May not be representative

1995

Year	Area	No. Days of Data	Maximum Concentration in ppm 1-hour	2nd High Concentration ppm 1-hour	No. Days Standard Exceeded – Federal >0.12 ppm 1-hr.	No. Days Standard Exceeded – State >0.09 ppm 1-hr
1995	Central LA	365	.17	.15	5	38
1995	North West Coast LA County	344*	.14*	.12*	1*	19*
1995	South West Coast LA County	365	.12	.10	0	3
1995	South Coast LA County	361	.11	.11	0	3
1995	West San Fernando Valley	365	.15	.14	8	47
1995	East San Fernando Valley	365	.17	.16	20	58
1995	West San Gabriel Valley	362	.21	.19	44	88
1995	East San Gabriel Valley	365	.22	.21	73	118
1995	Pomona/Walnut Valley	365	.22	.20	47	87
1995	South San Gabriel Valley	365	.18	.17	20	66
1995	South Central LA County	363	.09	.08	0	0
1995	Santa Clarita Valley	365	.21	.17	26	72
1995	Antelope Valley 1	360	.14	.14	5	6119

*Less than 12 full months of data. May not be representative

Source: South Coast Air Quality Management District (AQMD)

Environment Main Page

Browse to Next Page

L.A. Wall Maps:

� L.A. City
Neighborhoods

� L.A. City Zip Codes

� All L.A. County
(All 88 cities-plus)

Available Now!

Home

Write to Us

Visitor Agreement

Privacy Statement

Copyright � 1998-2013 by Given Place Media, All Rights Reserved.
All original text, photos, and graphics in the Los Angeles Almanac web site are copyrighted
and may not be published, broadcast, rewritten or redistributed without permission.
We make no copyright claim, however, to statistical data featured in this web site.
Get permission to use content contained within this website.