An aerosol is a suspension of liquid or solid particles in a gas, with particle diameters in the range of 1nm to 100μm. Primary aerosols contain particles introduced directly into the gas; secondary aerosols form through gas-to-particle conversion. Various types of aerosol, classified according to physical form and how they were generated, include dust, fume, mist, smoke and fog. There are several measures of aerosol concentration (wikipedia).
Credit : NASA Earth Observatory
Source : NASA Earth Observatory - Wikipedia
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