Cleanrooms are enclosed facilities specially designed to control levels of airborne contamination. Depending on the particle concentration (per m3), clean rooms are categorized into nine ISO classes. Class 1 being the purest and containing only 12 particles per cubic meter. By contrast, the particulate concentration of ambient air is around 35 million particles per cubic meter. Sampling gas detectors are used to monitor for safety cleanroom environments in scientific research and manufacturing industries.
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