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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Concord-2975 Treat Blvd
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
0.05       0.42 0.137 5 0.04  
1999
0.02 0.13 0.155 0.36 0.49 0.126 30 0.04 58
1998
0.02 0.14 0.192 0.45 0.56 0.176 31 0.04 72
1997
0.02 0.11 0.176 0.37 0.50 0.149 30 0.04 66
1996
0.02 0.10 0.149 0.36 0.54 0.131 31 0.04 56
1995
0.07 0.19 0.242 0.44 0.74 0.166 30 0.04 91
1994
0.02 0.16 0.232 0.40 1.0 0.196 32 0.04 87
1993
0.06 0.20 0.305 0.70 0.77 0.231 30 0.04 114
1992
0.02 0.18 0.253 0.67 0.72 0.228 31 0.04 95
1991
0.02 0.14 0.265 0.59 0.87 0.246 29 0.04 100
1990
0.02 0.20 0.315 0.68 1.1 0.280 28 0.04 118
1989
0.08 0.24 0.341 0.65 0.87 0.248 21 0.04 128
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.