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Historical Ozone Air Quality Trends

8-Hour Ozone Exceedance Days 1-Hour Ozone Exceedance Days Stage1AndHealthAdvisory


OZONE, 1976 - 2018

Number of Basin-Days Exceeding Health Standard Levelsa)

Year

Old Federal Standard

1-hour average

> 0.12 ppm

1997 Federal Standard

8-hour average

 > 0.08 ppm

2008 Federal Standard

8-hour average

 > 0.075 ppm

2015 Federal Standard

8-hour average

 > 0.070 ppm

Health Advisory

1-hour average

≥ 0.15 ppm

Stage 1 Episode

1-hour average

≥ 0.20 ppm

Basin Maximum

1-hour average

ppm

Basin Maximum

8-hour average

ppm

2018

11

59

108

141

0

0

0.142

0.125

2017

28

82

121

145

3

0

0.158 

0.136

2016

19

63

103

132

2

0

0.163

0.121

2015

11

47

81

113

0

0

0.144

0.127

2014

10

54

92

126

0

0

0.141

0.110

2013

6

56

88

116

1

0

0.151

0.122

2012

12

65

111

138

0

0

0.147

0.112

2011

17

71

106

122

1

0

0.160 

0.136

2010

7

63

102

123

0

0

0.143

0.123

2009

17

81

113

129

3

0

0.176

0.128

2008

28

80

119

140

7

0

0.176

0.131

2007

19

78

108

126

5

0

0.171

0.137

2006

37

85

114

129

8

0

0.175

0.142

2005

32

83

116

136

8

0

0.182

0.145

2004

31

88

115

148

2

0

0.163

0.145

2003

66

109

133

151

26

0

0.194

0.153

2002

48

96

132

146

15

0

0.169

0.144

2001

37

92

128

154

13

0

0.190

0.144

2000

37

94

126

145

10

0

0.184

0.149

1999

39

93

120

144

6

0

0.174

0.142

1998

61

93

120

138

38

11

0.244

0.206

1997

66

118

155

174

22

1

0.205

0.148

1996

85

115

141

163

46

6

0.239

0.173

1995

98

120

150

170

57

11

0.256

0.203

1994

119

148

164

175

88

19

0.30

0.208

1993

124

161

183

205

92

23

0.28

0.195

1992

142

173

191

199

108

41

0.30

0.218

1991

130

160

176

188

101

47

0.32

0.203

1990

132

161

181

193

107

43

0.33

0.193

1989

157

181

210

221

120

54

0.34

0.252

1988

178

194

207

215

145

78

0.35

0.258

1987

161

179

190

198

130

66

0.33

0.210

1986

164

189

208

219

140

79

0.35

0.251

1985

158

180

200

207

136

83

0.39

0.288

1984

175

190

203

214

147

97

0.34

0.248

1983

152

168

181

191

139

87

0.39

0.258

1982

150

164

182

196

126

67

0.40

0.265

1981

184

196

212

225

166

102

0.37

0.282

1980

167

179

199

211

153

102

0.49

0.336

ppm = parts per million parts of air, by volume.
a) Basin-days represents the number of days a standard was exceeded anywhere in the South Coast Air Basin. 



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South Coast Air Basin Ozone Trends (CSV, 1kb)

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