Table 2.3.

Generation amount of atmospheric dust

Type of dust source			Generation rate (t/d)	Percentage (the maximum)
Natural source	Direct	Sea salt particle	3 × 106	28
		Wind dust	2 × 104 – 106	9.3
		Forest fire	4 × 105	3.8
		Volcanic eruption	104	0.09
		Meteoric dust	5 × 10 – 5.5 × 102
	Indirect	Botanic activity (such as pollen release)	5 × 105 – 3 × 106	28
		Circulation of sulfur and nitrogen	3 × 106	24.1
	Subtotal		10.1 × 106
Artificial source	Direct	Combustion and industry	1–3 × 105	2.8
		Wind dust (by farming)	102 – 103	0.009
	Indirect	From component with aerosol generator	3.7 × 105	3.453
	Subtotal		6.7 × 105
In total			10.7 × 106