“There is a toggle that changes the PM setting to 1 or 2.5 or 10. What does PM stand for? What do the various settings indicate? The large digital number in the middle of the dial is at zero. What does that mean? What should it be at optimum number?”

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• PM stands for particle size. Measured in microns. 0 is better number.

  Answered by james 1 year ago

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• PM means particulate matter in the air that is detected by the sensors and 0 is optimal for all levels.meaning the air is clean.

  Answered by Jacob 1 year ago

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• The setting indicates different sizes of particulates.

  Answered by RyanC 1 year ago

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• It just tells you the particle size being filter and how much is left in the air.

  Answered by Random 1 year ago

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