Lynn Poole discusses the work of an industrial hygienist and notes that although there are many aspects of industrial hygiene, this program focuses on atmospheric contamination and its remediation. Dr. Anna M. Baetjer describes dusts (especially silica dust) and solvents (especially carbon tetrachloride) and the research being done to determine their effect on human workers. Charles E. Couchman, a Baltimore city industrial hygienist, demonstrates how carbon monoxide testing can be done with an instrument. Hopcalyte, developed at Johns Hopkins University and University of California, is used to reduce carbon monoxide levels. Allen D. Brandt, an engineer for Bethlehem Steel, shows photographs of exhaust systems at local industries and the collection and removal of particulate matter.