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Ambient Air Quality and Human Health Risk Assessment of Heavy Metals in a Potentially Toxic Silver-Polluted Environment

Research Journal of Ecology and Environmental Sciences | Vol 5, Issue 1

Table 3. US NationalAmbient Air Concentration (µg/cm³)

Heavy Metals	Rural	Urban	Industrial
Ag⁺	0.0005	0.004	0.6
Cd²⁺	0.001	0.008	0.4
Cr²⁺	0.002	0.02	0.76
Pb²⁺	0.02	0.04	0.037