Table 2.11.

Composition of atmospheric dust

Composition	Content (%)
Mineral debris, dross from combustion	10–90
Smoke and pollen	0–20
Plant fiber such as cotton	5–40
Fine particles including coal, charcoal, cement, and concrete	0–40
Decayed plant, scurf	0–10
Metal	0–0.5
Microorganism	Extreme small