Available Substances Order a Data CD Toxics Statistics Home Page Data Descriptions Page
California Home ARB: Home Search Site Map Contact Us
California Air Resources Board

Annual Statewide Toxics Summary
ARB's ADAM Air Quality Database
Silicon FAQs
nanograms per cubic meter
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
2017
* * * * * * 0 *
2016
* * * * * * 0 *
2015
* * * * * * 0 *
2014
* * * * * * 0 *
2013
* * * * * * 0 *
2012
* * * * * * 0 *
2011
* * * * * * 0 *
2010
* * * * * * 0 *
2009
* * * * * * 0 *
2008
* * * * * * 0 *
2007
* * * * * * 0 *
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
480 2400 * 5600 17000 2980 86 2
2002
92 4200 5240 11000 23000 3900 491 2
2001
130 3500 4550 9800 19000 3620 505 3
2000
94 3800 4650 10000 23000 3770 472 3
1999
130 3300 4630 9900 27000 4080 565 3
1998
42 2600 3680 8300 28000 3670 559 3
1997
85 3200 4110 8100 27000 3760 553 3
1996
74 2800 3770 8400 21000 3390 595 3
1995
53 3400 4390 9900 24000 4130 602 3
1994
90 3300 4060 8600 17000 3130 585 3
1993
91 3500 4350 9200 24000 3850 575 3
1992
44 3500 4540 9700 40000 3940 554 3
1991
100 4000 5520 12000 62000 5150 567 3
1990
400 5900 * 15000 28000 5180 309 3
1989
* * * * * * 0 *
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.
"*" means there was insufficient or no data available to determine the value.