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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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