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2. secondary crushing uses tertiary crushing emission factors per footnote n of ap-42 ch. 11.19.2-2. from ap-42 ch. 13.2.4 was used to estimate pm2.5 emission factors. pm2.5 ef pm10 ef0.350.053 truck unloading fragmented stone truck loading conveyor crushed stone emission factor source total pm emissions tonyr total pm10 emissions.
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