Number of Days Exceeding Federal and State Air Quality Standards per Year

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Number of Days Exceeding Federal & State Air Quality Standards per Year
Los Angeles County
Tables are for Los Angeles County portions of the South Coast & Mojave Desert Air Quality Management Districts

Los Angeles County Portion of South Coast Air Quality Management District (Map)

Year	Ozone		Respirable Particle Matter (Pm¹⁰)		Carbon Monoxide
Year	Days Above State 1-Hr. Standard (0.09 ppm)*	Days Above Federal 1-Hr. Standard (0.12 ppm)*	Calculated Days Above State 24-Hr. Standard (50 ug/m³)**	Calculated Days Above Federal 24-Hr. Standard (150 ug/m³)**	Days Above State 8-Hr. Standard (9.0 ppm)*	Days Above Federal 8-Hr. Standard (9.0 ppm)*
2001	70	12	132	0	0	0
2000	57	12	144	0	6	3
1999	43	6	210	0	11	7
1998	68	35	96	0	13	10
1997	89	27	144	0	16	12
1996	109	55	144	0	23	17
1995	127	79	138	6	18	14
1994	142	102	144	0	28	20
1993	158	102	156	0	24	19
1992	174	129	144	12	32	28
1991	159	111	234	0	44	39
1990	168	120	186	6	46	43
Year	Ozone		Respirable Particle Matter (Pm¹⁰)		Carbon Monoxide
Year	Days Above State 1-Hr. Standard (0.09 ppm)*	Days Above Federal 1-Hr. Standard (0.12 ppm)*	Calculated Days Above State 24-Hr. Standard (50 ug/m³)**	Calculated Days Above Federal 24-Hr. Standard (150 ug/m³)**	Days Above State 8-Hr. Standard (9.0 ppm)*	Days Above Federal 8-Hr. Standard (9.0 ppm)*
1989	192	140	240	6	69	63
1988	205	165	246	0	63	54
1987	190	145	228	6	43	39
1986	209	162	---	---	55	48
1985	201	154	---	---	62	52
1984	196	153	---	---	72	66
1983	178	146	---	---	59	52
1982	180	142	---	---	71	69
1981	216	178	---	---	81	73
1980	189	151	---	---	98	94

Los Angeles County Portion of Mojave Desert Air Quality Management District (Map)

Year	Ozone		Respirable Particle Matter (Pm¹⁰)		Carbon Monoxide
Year	Days Above State 1-Hr. Standard (0.09 ppm)*	Days Above Federal 1-Hr. Standard (0.12 ppm)*	Calculated Days Above State 24-Hr. Standard (50 ug/m³)**	Calculated Days Above Federal 24-Hr. Standard (150 ug/m³)**	Days Above State 8-Hr. Standard (9.0 ppm)*	Days Above Federal 8-Hr. Standard (9.0 ppm)*
2001	37	3	---	---	0	0
2000	35	2	---	---	0	0
1999	1	0	12	0	0	0
1998	24	8	12	0	0	0
1997	14	0	9	0	0	0
1996	40	1	12	0	0	0
1995	92	34	18	0	0	0
1994	62	10	18	0	0	0
1993	59	14	54	0	0	0
1992	78	25	30	0	0	0
1991	62	8	66	12	0	0
1990	52	7	132	12	0	0
Year	Ozone		Respirable Particle Matter (Pm¹⁰)		Carbon Monoxide
Year	Days Above State 1-Hr. Standard (0.09 ppm)*	Days Above Federal 1-Hr. Standard (0.12 ppm)*	Calculated Days Above State 24-Hr. Standard (50 ug/m³)**	Calculated Days Above Federal 24-Hr. Standard (150 ug/m³)**	Days Above State 8-Hr. Standard (9.0 ppm)*	Days Above Federal 8-Hr. Standard (9.0 ppm)*
1989	95	27	147	0	0	0
1988	105	44	---	---	0	0
1987	105	32	---	---	0	0
1986	108	47	---	---	0	0
1985	106	58	---	---	0	0
1984	110	49	---	---	0	0
1983	93	42	---	---	0	0
1982	82	25	---	---	0	0
1981	133	82	---	---	0	0
1980	106	61	---	---	0	0

* ppm - parts per million
** Tiny solid or liquid particles of soot, dust, smoke, fumes, or mists. The size of the particles (10 microns or smaller, about 0.0004 inches or less) allows them to enter the air sacs deep in the lungs where they may be deposited to the result in adverse health effects. Also causes visibility reduction. Data listed here are reported as 24-hour average concentrations in ug/m³ (weight of particles in micrograms per one cubic meter of air).

Source: California Air Resources Board

Smog Kills. According to the South Coast Air Quality Management District, an estimated 1,600 people die prematurely each year in the greater Los Angeles region due to smog. Thousands more suffer temporary or long-term health effects and millions more are at least inconvenienced.

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