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The concentration of atmospheric dust
Atmospheric dust is clean room to deal directly with the object, in clean technology, the most commonly used in particles of 0.5 microns or the concentration of counting amount subject to the cleanest stratosphere (10 km) away from the earth's surface, about 20 grains/L such particles, very clean over the sea, about 2600 / L. Counting on land concentration difference is great, the same in different time difference is very big also, in the atmospheric concentration of counting can be divided into "industrial city", "city outskirts", "industrial area or rural", its acuity 0.5 microns particle concentrations respectively 1 x 106 / L, 2 x 105 / L and 3 x 105 / L.
The concentration of atmospheric bacteria
Atmospheric pollution belongs to abiotic particles of dust pollution, pollution and atmospheric bacteria belong to have life particle pollution. Microorganisms including viruses, Eric ?