The course introduces respiratory and dermal physiology, a detailed review of removal mechanisms of aerosols and organic vapors, and the chemical resistance performance of various types of chemical protective clothing and gloves. The most effective way to prevent occupational noise-induced hearing loss is by implementing engineering noise controls. The course will also describe the different levels that noise control strategies may act on. Some demonstrations allow comparing initial and improved noise situations. The course will discuss basic topics in engineering economy analysis used in evaluating the economic feasibility of investment projects.