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Suspended particulates

Partial Size Significance

Large Size Particles -
Defined as ¾ 10 micrometers (µm) in diameter.
Do not remain in suspension and settle from Troposphere in < 1 day

Medium Size Particles -
Defined as > 1 < 10 micrometers (µm) in diameter.
Remain in suspension for Several days

Fine Size Particles -
Defined as < 1 micrometer in diameter.
Remain in Troposphere for 1-2 weeks and in Stratosphere for 1-5 years
Generally these will be distributed over the entire earth

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