Journal of Environmental and Public Health / 2010 / Article / Tab 3 / Research Article
Navajo Coal Combustion and Respiratory Health Near Shiprock, New Mexico Table 3 Selected results for trace metal concentrations (μ g/m³ ) from ambient air samples collected in 2005. Zero values indicate that the element, if present, was below the detection limits.
Element Nav1 Nav10 Nav22 Nav16 Nav50 Nav7 Nav44 Nav38 Nav11 Nav34 Nav25 Nav26 health levels arsenic (As) 0.005 0.012 0.014 0.021 0.028 0.001 0.004 0.040 0.001 0.005 0.007 0.006 1
0
a
beryllium (Be) 0 0 0 0 0 0 0 0 0 0 0 0 0.0
1
b
chromium (Cr) 0.003 0.013 0.014 0.001 0 0.007 0 0.014 0 0.007 0 0 50
0
c
cadmium (Cd) 0 0 0 0 0 0 0 0 0 0 0 0 10
0
a
lead (Pb) 0 0.002 0.003 0.005 0.004 0.002 0.002 0.007 0.001 0.001 0.002 0.003 1.
5
d
manganese (Mn) 0.001 0.008 0.005 0.007 0.007 0.003 0.002 0.026 0.003 0.005 0.007 0.014 500
0
a
mercury (Hg) 0 0 0 0.001 0 0 0 0.001 0 0.001 0.002 0.001 10
0
a
nickel (Ni) 0 0.003 0 0 0 0.008 0.001 0.018 0 0.001 0.003 0 100
0
a
selenium (Se) 0.001 0.007 0.010 0.007 0.009 0.004 0.003 0.041 0.002 0.004 0.004 0.008 20
0
a
antimony (Sb) 0 0.001 0.001 0.001 0.002 0.001 0.002 0.001 0 0 0.002 0.002 50
0
a
cobalt (Co) 0 0 0 0 0 0 0 0 0 0 0 0 10
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 ).