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aerosol AIHA air ﬂow air pollution air samples Association atmospheric average benzene beryllium blood carbon carbon monoxide carbon tetrachloride centration Chemical chromium Company concentration contamination count cubic curve determined diameter dose duraluminum dust eﬁiciency electrostatic precipitator Engineering equipment evaluation excretion exhaust exposure ﬁeld ﬁlm Filter ﬁlter papers ﬁndings ﬁrst ﬁve ﬂuoride fuels fume fumigation hazard Health hood Hygienic Guides indicated Industrial Hygiene Industrial Hygienists instrument laboratory lead levels liquid liver lung machine material maximum measured Medical membrane ﬁlter ment method micron modiﬁcation nitrogen dioxide noise obtained operation ozone particle size particles period phenol plant plutonium precipitation problem procedures produced radiation radioactive range reagent respiratory Rose Bengal shown signiﬁcant soluble solution Speciﬁc stack standard steel sulfur dioxide sulfuric acid Table tank technique temperature tion toxic values vapor velocity ventilation welding