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Air Cleaners Don’t Stop You Getting Sick, Research Shows
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Ahhh.. I checked the size but thought microns and nanometers were interchangeable terms. Thanks for the correction.
I was taught μm stands for micrometers, which are 1,000 times smaller than millimeters. Nanometers(nm) are 1,000 times smaller than micrometers(μm), which means nanometers are CRAZY small!