It has been estimated that 80% of the contaminants found in a typical cleanroom originate from people. Given the inherently non-sterile nature of human beings, this is hardly surprising. The human scalp, for instance, contains about one million microorganisms per square centimetre. And these organisms can spread around with alarming ease-in fact, people routinely introduce contaminants into their immediate environment just by talking or moving around. The more physically active they are, the more pollutants they shed.
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