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(PM2.5 refers to atmospheric particulate matter (PM) that have a diameter of less than 2.5 micrometers, which is about 3% the diameter of a human hair.)
The PM2.5 filters last for 48-72 hours depending on usage and the environment they are used in. It's recommended approximately 2-3 days for frequent use and 5-7 days for occasional use. We'll be offering packs of filters so you can just keep changing them as you want.
We recommend the main polyester mask is washed with soap and warm water regularly to keep it clean.