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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
San Jose-4th 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
0.09       0.78 0.234 9 0.04  
2001
0.02 0.12   0.33 0.74 0.158 28 0.04  
2000
0.02 0.11 0.193 0.52 1.0 0.226 30 0.04 72
1999
0.05 0.14 0.227 0.46 0.73 0.179 30 0.04 85
1998
0.08 0.24 0.293 0.66 0.90 0.227 31 0.04 110
1997
0.02 0.18 0.287 0.60 0.88 0.231 30 0.04 108
1996
0.02 0.19 0.311 0.77 1.2 0.285 31 0.04 117
1995
0.08 0.30 0.348 0.61 1.3 0.246 30 0.04 131
1994
0.10 0.25 0.385 0.81 1.6 0.340 31 0.04 145
1993
0.08 0.31 0.485 1.3 1.6 0.447 29 0.04 182
1992
0.02 0.26 0.436 1.1 1.6 0.413 31 0.04 164
1991
0.02 0.25 0.385 0.95 1.2 0.342 28 0.04 145
1990
0.10 0.33 0.549 1.33 1.9 0.515 28 0.04 207
1989
0.11 0.45 0.570 0.93 2.3 0.577 23 0.04 214
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.