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ASTM D7520-16
- Standard Test Method for Determining the Opacity of a Plume in the Outdoor Ambient Atmosphere
- standard by ASTM International, 04/01/2016
- Publisher: ASTM
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1.1 This test method describes the procedures to determine the opacity of a plume, using digital imagery and associated hardware and software. The aforementioned plume is caused by particulate matter emitted from a stationary point source in the outdoor ambient environment.