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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Fremont-Chapel Way
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 0.09 0.116 0.20 0.40 0.086 28 0.04 43
2001
0.02 0.11 0.132 0.23 0.44 0.094 30 0.04 50
2000
0.02 0.09 0.136 0.35 0.50 0.125 30 0.04 51
1999
0.02 0.15 0.176 0.31 0.69 0.138 29 0.04 66
1998
0.06 0.25 0.238 0.43 0.97 0.181 33 0.04 90
1997
0.10 0.20   0.36 0.53 0.124 13 0.04  
1996
0.02 0.16 0.199 0.36 0.74 0.151 31 0.04 75
1995
0.07 0.23 0.270 0.47 0.83 0.174 30 0.04 101
1994
0.07 0.20 0.252 0.50 0.83 0.180 31 0.04 95
1993
0.02 0.26 0.321 0.68 0.70 0.204 30 0.04 120
1992
0.02 0.19 0.193 0.35 0.63 0.136 29 0.04 72
1991
0.02 0.19 0.259 0.66 0.77 0.228 30 0.04 97
1990
0.02 0.21 0.283 0.67 0.86 0.233 30 0.04 106
1989
0.06 0.35 0.355 0.74 1.0 0.259 23 0.04 133
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.