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California Air Resources Board

Annual Toxics Summary
ARB's ADAM Air Quality Database
San Jose-4th Street
Methylene Chloride
parts per billion
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
Estimated
Risk
2002
0.1       0.4 0.10 9 0.1  
2001
0.5 0.05   0.2 0.3 0.18 28 0.1  
2000
0.5 0.5 0.50 0.5 0.5 0.00 29 1.0 2
1999
0.5 0.5   0.5 1.7 0.24 25 1.0  
1998
0.5 0.5   0.5 1.3 0.17 29 1.0  
1997
0.5 0.5 0.75 1.2 3.5 0.78 27 1.0 3
1996
0.5 0.5 0.55 0.5 1.3 0.18 31 1.0 2
1995
0.5 0.5 0.69 1.3 2.3 0.44 30 1.0 2
1994
0.5 0.5 0.80 2.1 6.3 1.20 31 1.0 3
1993
0.5 0.5 0.58 0.5 1.5 0.24 30 1.0 2
1992
0.5 0.5 0.66 0.5 6.3 1.04 31 1.0 2
1991
0.5 0.5 6.65 0.5 63 13.4 27 1.0 23
1990
0.5 0.5 0.83 1.4 2.8 0.60 27 1.0 3
1989
0.5 0.5 0.88 2.6 3.5 0.92 23 1.0 3
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.