Table 1.

Worldwide mean Cd emissions to the atmosphere in the mid-90s.

Source	Cadmium (t/a)	Reference
Natural sources		a
Soil particles	24,000
Forest and bush fires	13,000
Sea salt	2000
Volcanoes	1600
Meteoric dust	1,4 × 10−4
Anthropogenic sources		b
Non-ferrous metal production	2171
Iron and steel production	64
Stationary fossil fuel combustion	691
Cement production	17
Waste disposal (incineration)	40
Sum	43,600

^aRichardson et al. (2001)

^b:Pacyna and Pacyna (2001).