Table 3: Selected results for trace metal concentrations (μg/m³) from ambient air samples collected in 2005. Zero values indicate that the element, if present, was below the detection limits.

ElementNav1Nav10Nav22Nav16Nav50Nav7Nav44Nav38Nav11Nav34Nav25Nav26health levels

arsenic (As)0.0050.0120.0140.0210.0280.0010.0040.0400.0010.0050.0070.0061 0 a
beryllium (Be)0000000000000.0 1 b
chromium (Cr)0.0030.0130.0140.00100.00700.01400.0070050 0 c
cadmium (Cd)00000000000010 0 a
lead (Pb)00.0020.0030.0050.0040.0020.0020.0070.0010.0010.0020.0031. 5 d
manganese (Mn)0.0010.0080.0050.0070.0070.0030.0020.0260.0030.0050.0070.014500 0 a
mercury (Hg)0000.0010000.00100.0010.0020.00110 0 a
nickel (Ni)00.0030000.0080.0010.01800.0010.0030100 0 a
selenium (Se)0.0010.0070.0100.0070.0090.0040.0030.0410.0020.0040.0040.00820 0 a
antimony (Sb)00.0010.0010.0010.0020.0010.0020.001000.0020.00250 0 a
cobalt (Co)0 0000000000010 0 a

(a) Agency for Toxic Substances and Disease Registry—8 hour work day, 40 hour work week (http://www.atsdr.cdc.gov/tfacts4.html).
(b) Agency for Toxic Substances and Disease Registry—30 day period (http://www.atsdr.cdc.gov/tfacts4.html).
(c) National Institute for Occupational Safety and Health—time-weighted average (10 hours)
(http://www.atsdr.cdc.gov/HEC/CSEM/chromium/standards_regulations.html).
(d) U.S. EPA, NAAQS—quarterly average (http://www.epa.gov/air/criteria.html).