After reviewing the sources of hazards during corn. plastics processing (granulation of polyolefins, prodn. of shoes by processing PVC, thermoplastic rubber and polyurethane foams, prodn. of brushes by processing polyethylene terephthalate, thermal processing of nitrite rubber, prodn. of laminates by using styrene-contg. polyster resins), some hazardous substances (dusts, HCl, ClCH=CH2, styrene, butadiene, MeCl, (OHCH2)(2), nitric oxides, AcMe) were detd. in work-place air by spectrophotometly and chromatog. The max. permissible concns. were exceeded in a few cases (styrene, (OHCH2)(2)) only. The max. permissible noise levels were exceeded in many cases. The phenomenon of Monday fever at people exposed to styrene was also obsd.