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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
San Francisco-Arkansas 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
0.06 0.13   0.33 0.41 0.111 16 0.04  
2001
0.02 0.09 0.113 0.22 0.38 0.091 30 0.04 42
2000
0.02 0.07 0.128 0.23 0.59 0.126 29 0.04 48
1999
0.04 0.15 0.173 0.32 0.49 0.120 26 0.04 65
1998
0.02 0.18 0.215 0.40 0.74 0.161 31 0.04 81
1997
0.02 0.13 0.165 0.35 0.67 0.140 30 0.04 62
1996
0.02 0.13 0.181 0.40 0.64 0.146 31 0.04 68
1995
0.10 0.16 0.226 0.44 0.85 0.167 29 0.04 85
1994
0.07 0.20 0.259 0.53 0.66 0.166 30 0.04 97
1993
0.08 0.20   0.65 0.89 0.222 27 0.04  
1992
0.02 0.20 0.234 0.47 0.62 0.165 30 0.04 88
1991
0.07 0.17 0.252 0.51 0.89 0.198 26 0.04 95
1990
0.02 0.23   0.62 0.79 0.201 27 0.04  
1989
0.08 0.23 0.331 0.65 1.1 0.252 23 0.04 124
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.