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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Chula Vista
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
0.02 0.10 0.107 0.23 0.29 0.079 31 0.04 40
2001
0.02 0.09 0.110 0.26 0.36 0.094 30 0.04 41
2000
0.02 0.09 0.136 0.32 0.51 0.127 30 0.04 51
1999
0.02 0.25   0.39 0.44 0.140 21 0.04  
1998
0.02 0.13 0.153 0.32 0.40 0.110 29 0.04 57
1997
0.02 0.14 0.162 0.32 0.60 0.125 30 0.04 61
1996
0.02 0.15   0.29 0.59 0.129 26 0.04  
1995
0.07 0.19 0.205 0.34 0.49 0.101 29 0.04 77
1994
0.07 0.20 0.262 0.45 0.54 0.149 31 0.04 98
1993
0.02 0.19 0.225 0.43 0.59 0.144 31 0.04 85
1992
0.02 0.14 0.184 0.35 0.44 0.124 30 0.04 69
1991
0.02 0.11 0.183 0.39 0.62 0.158 29 0.04 69
1990
0.02 0.25 0.278 0.54 0.65 0.162 31 0.04 105
1989
0.02 0.27 0.255 0.49 0.53 0.153 24 0.04 96
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.