PM Crystalline Silica Emission Factors and Ambient
) crystalline silica emissions from aggregate pro-ducing plants or other mineral industry sources. The PM 4 crystalline silica emission factors can be estimated based on published data concerning emission factors for PM of aerodynamic diameter of 10 m (PM 10)or2.5 m (PM 2.5) or less for aggregate producing plants.1–9 The U.S. Envi-
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