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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Simi Valley-Cochran Street
1,3-Butadiene
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.02 0.08 0.134 0.26 0.44 0.107 27 0.04 50
2001
0.02 0.11 0.118 0.25 0.33 0.081 27 0.04 44
2000
0.02 0.08 0.103 0.21 0.34 0.083 30 0.04 39
1999
0.02 0.10   0.26 0.39 0.098 25 0.04  
1998
0.02 0.15   0.19 0.37 0.077 28 0.04  
1997
0.02 0.14 0.138 0.24 0.41 0.086 30 0.04 52
1996
0.02 0.14 0.161 0.28 0.31 0.082 30 0.04 60
1995
0.02 0.15 0.198 0.38 0.41 0.107 31 0.04 74
1994
0.02 0.18 0.230 0.35 0.56 0.128 29 0.04 86
1993
0.07 0.18 0.237 0.49 0.72 0.171 28 0.04 89
1992
0.02 0.16 0.182 0.36 0.54 0.133 29 0.04 68
1991
0.02 0.11 0.180 0.50 0.57 0.175 29 0.04 68
1990
0.02 0.18 0.214 0.40 0.67 0.160 30 0.04 80
1989
0.02 0.16 0.242 0.49 0.59 0.195 21 0.04 91
Notes:  Values below the Limit of Detection (LoD) assumed to be ½ LoD.
Means and risks shown only for years with data in all 12 months.
Risks shown only for those substances with unit risk factors.