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Annual Toxics Summary
ARB's ADAM Air Quality Database
Upland-San Bernardino Road FAQs
Silicon
nanograms per cubic meter
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
2024
* * * * * * 0 *
2023
* * * * * * 0 *
2022
* * * * * * 0 *
2021
* * * * * * 0 *
2020
* * * * * * 0 *
2019
* * * * * * 0 *
2018
* * * * * * 0 *
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
* * * * * * 0 *
2002
* * * * * * 0 *
2001
* * * * * * 0 *
2000
* * * * * * 0 *
1999
* * * * * * 0 *
1998
* * * * * * 0 *
1997
1200 4700 * 7200 8000 2090 26 3
1996
98 4700 3960 6900 7700 2250 27 3
1995
360 3700 3840 6900 7800 2200 30 3
1994
1100 4200 4260 6300 7800 1760 28 3
1993
120 4200 4100 6900 8900 2260 28 3
1992
180 4400 4400 7200 9000 2350 30 3
1991
340 5500 * 8700 16000 3230 28 3
1990
3500 6500 * 8800 9700 1810 16 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.