The common reference used is nanograms per cubic meter as represented by ng/m3 (nanograms per cubed meter). This is the value that SCAQMD uses to report on the level of hexavalent chromium identified by air monitors that have been positioned around the City.
Hexavalent chromium and total chromium emissions from chrome plating and anodizing equipment are measured by the SCAQMD METHOD 205.1 using a wet impingement train. For more details, please visit this link [PDF].
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