Historic Ozone Air Quality Trends

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Historic Ozone Air Quality Trends
Number of Basin Days* Exceeding Health Standard Levels
Los Angeles County

Year	State Standard (.09 ppm)**	Federal Standard (.12 ppm)	Health Advisory (.15 ppm)	Stage 1 Episode (.20 ppm)	Stage 2 Episode (.35 ppm)	Basin Maximum (ppm)
1999	118	41	12	0	0	0.17
1998	114	62	43	12	0	0.24
1997	141	68	28	1	0	0.21
1996	151	90	53	7	0	0.24
1995	154	98	59	14	0	0.26
1994	165	118	96	23	0	0.30
1993	185	124	92	24	0	0.28
1992	191	143	109	41	0	0.30
1991	183	130	100	47	0	0.32
1990	184	130	107	41	0	0.33
1989	211	157	120	54	0	0.34
1988	216	178	144	77	1+	0.35
Year	State Standard (.09 ppm)**	Federal Standard (.12 ppm)	Health Advisory (.15 ppm)	Stage 1 Episode (.20 ppm)	Stage 2 Episode (.35 ppm)	Basin Maximum (ppm)
1987	196	160	130	66	0	0.33
1986	217	164	140	79	1	0.35
1985	206	158	136	83	7	0.39
1984	207	173	146	97	0	0.34
1983	190	152	138	84	3	0.39
1982	191	149	121	63	2	0.40
1981	222	180	159	99	5	0.37
1980	210	167	152	101	15	0.41
1979	226	191	169	120	17	0.45
1978	217	187	173	116	23	0.43
1977	242	208	184	121	11	0.39
1976	237	194	166	102	7	0.38

* Basin days represents the number of days when a standard was exceeded anywhere in the South Coast Air Basin.
** Parts per million
Source: South Coast Air Quality Management District (AQMD)

For two years in a row, during 2000 and 2001, the greater Los Angeles metropolitan area had no Stage 1 ozone episodes when air quality was very unhealthy.

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