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Calculating the Fitted Filtration Efficiency of Face Coverings

Published by U.S. EPA Office of Research and Development (ORD) | U.S. Environmental Protection Agency | Metadata Last Checked: August 02, 2025 | Last Modified: 2025-04-08
This code is used to calculate fitted filtration efficiency of disposable respiratory protection as measured by the difference between particulate counts in ambient vs. "behind mask" air sampled using condensation particulate counters.

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