Which two agencies were involved in the 1940s tests that evolved into the HEPA standard?

Answer

The U.S. Army Chemical Corps and the Atomic Energy Commission.

The tests that established the benchmark for HEPA filters were conducted by the U.S. Army Chemical Corps and the Atomic Energy Commission during the 1940s.

Which two agencies were involved in the 1940s tests that evolved into the HEPA standard?
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