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California Air Resources Board

Annual Toxics Summary
ARB's ADAM Air Quality Database
Richmond-13th Street
Benzene
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
0.1       2.0 0.62 9 0.2  
1996
0.25 0.25 1.00 2.2 5.9 1.22 32 0.5 92
1995
0.25 1.3 1.44 2.2 2.8 0.60 30 0.5 133
1994
0.25 1.8 1.70 2.6 3.3 0.74 31 0.5 157
1993
0.25 1.6 1.76 2.6 3.4 0.64 30 0.5 163
1992
0.25 1.5 1.54 2.4 2.9 0.65 29 0.5 143
1991
0.25 1.4 1.92 3.8 4.3 1.13 29 0.5 177
1990
0.8 2.0   3.6 7.2 1.31 28 0.5  
1989
1.0 1.9   4.6 5.4 1.30 23 0.5  
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.