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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Richmond-13th 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    
2001
            0    
2000
            0    
1999
            0    
1998
            0    
1997
0.02       0.53 0.179 10 0.04  
1996
0.02 0.20 0.251 0.41 0.66 0.149 31 0.04 94
1995
0.13 0.29 0.300 0.45 0.68 0.129 30 0.04 113
1994
0.13 0.30 0.308 0.50 0.55 0.129 31 0.04 116
1993
0.14 0.32 0.393 0.69 0.83 0.183 30 0.04 148
1992
0.08 0.25 0.260 0.41 0.47 0.115 29 0.04 98
1991
0.07 0.18 0.272 0.47 0.83 0.181 29 0.04 102
1990
0.13 0.28   0.65 0.77 0.178 28 0.04  
1989
0.11 0.24   0.52 0.78 0.182 21 0.04  
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.