What are the different physical forms of atmospheric pollutants? Poeiras are small solid particles, with a diameter of 0.1 to over 100 microns, or...
Poeiras are small solid particles, with a diameter of 0.1 to over 100 microns, originating from larger particles, by mechanical processes of disintegration, such as sanding, grinding, etc., or natural dust such as pollen, spores, etc.
Fumes are solid particles with a diameter of less than one micron, formed by the condensation of vapors of solid materials, usually metals, and consequently solidification. Normally this mechanism is accompanied by oxidation. Fumes are inorganic.
Smoke is particles, usually but not necessarily, solid in suspension in the air, and originating from the incomplete combustion of organic materials.
a) I and II are correct.
b) II and III are correct.
c) I, II, and III are correct.
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Ed 
The different physical forms of atmospheric pollutants are: - Dusts: small solid particles with a diameter of 0.1 to over 100 microns, originating from larger particles, by mechanical processes of disintegration, such as sanding, grinding, etc., or natural dust such as pollen, spores, etc. - Fumes: solid particles with a diameter of less than one micron, formed by the condensation of vapors of solid materials, usually metals, and consequently solidification. Normally this mechanism is accompanied by oxidation. Fumes are inorganic. - Smoke: particles, usually but not necessarily, solid in suspension in the air, and originating from the incomplete combustion of organic materials. The correct alternative is c) I, II, and III are correct.
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