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The U.S. Environmental Protection Agency (EPA), Research Triangle Park, North Carolina is responsible for procuring, testing, and distributing filters of high purity to the State/local air pollution control agencies. The Teflon® filters are used with a sampler to collect PM2.5 and PM10 (particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers or 10 micrometers, respectively) samples.

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