Dust (Suspended Particulate Matter) Dust in the atmosphere, air pollution is the most important of Bangkok and.Megacities, which affect the health of people in both direct and indirect, consisting of various substances.Both solid and liquid distribution in the atmosphere are a group of molecules that are seen by the naked eye cannot see.Size ranges from 0.002 to Micron dust that is larger than 500 Micron, which is divided into 3 categories as follows:• Dust smaller than 10 micron • Total particulate (Total Suspended Particulate: TSP) is smaller than 100 Micron. • Heavy dust (dust fall) or 100 Micron in size from dust.
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