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4. PM 2.5. If the mask is marked with “PM 2.5”, it means the mask can effectively block small suspended particles with a diameter of 2.5 microns or more in the air. Generally, it is designed to protect against air pollution or sand storms. If the mask is only rated as PM2.5, it is not effective in preventing coronavirus.

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Health care workers who use these respirators are required by law to undergo an annual fit test — a check to make sure the mask forms a tight seal on the wearer's face so that contaminated air ...

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