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ISO Cleanroom Classification

Clean room classifications are on the basis of how clean the air is in the enclosed area. As per the Federal Standard 209 (A to D) of the USA, the number of particles equal to and greater than 0.5 m is measured in one cubic foot of air, and this is used as a benchmark for ISO cleanroom classification. This is also acceptable in the Federal Standard 209E version, which is used domestically. The latest version of the standard is TC 209 from the International Standards Organization and both of these standards classify clean rooms on the basis of the number of particles found in the area's air.
Clean Room Classification is based on the number and size of particles permitted per volume of air in an enclosed area. Large numbers like "class 100" or "class 1000" refer to FED_STD-209E, which refers to the number of particles of size 0.5 m or larger permitted per cubic foot of air. As per Federal Standards 209E and ISO 14644-1, there is a log-log relationship between particle size and its concentration, which concludes that there is nothing as a 0 particle concentration. Because, The ordinary room air falls under approx. Class 10,00,000 or ISO 9 clean room classification.