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California Air Resources Board

Annual Statewide Toxics Summary		 ARB's ADAM Air Quality Database
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 0.172 0.39 2.8 0.233 459 0.04 65
2001
0.02 0.13 0.174 0.39 1.2 0.176 499 0.04 65
2000
0.02 0.12 0.183 0.45 1.2 0.195 526 0.04 69
1999
0.02 0.14 0.225 0.50 3.0 0.240 595 0.04 85
1998
0.02 0.19 0.245 0.54 1.4 0.214 616 0.04 92
1997
0.02 0.16 0.234 0.53 1.2 0.210 578 0.04 88
1996
0.02 0.18 0.262 0.54 2.0 0.236 626 0.04 99
1995
0.02 0.24 0.310 0.66 3.2 0.275 616 0.04 117
1994
0.02 0.25 0.343 0.68 1.9 0.280 611 0.04 129
1993
0.02 0.28 0.392 0.83 2.8 0.349 593 0.04 147
1992
0.02 0.23 0.320 0.75 1.6 0.293 594 0.04 120
1991
0.02 0.22 0.341 0.79 1.7 0.313 580 0.04 128
1990
0.02 0.30 0.412 0.88 2.4 0.344 581 0.04 155
1989
0.02 0.31 0.426 0.86 2.4 0.365 436 0.04 160
Graph It!
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.