[Industrial hygiene and improvement of the work environment]

The AA. report a series of practical experiments in the following industries: textiles, ceramics, graphics and heavy industry, in order to demonstrate the necessity and utility of industrial hygiene in which an occupational hazard is not simply identified, but rather an improvement of the work environment is undertaken and the results of such a programme are again controlled and evaluated. The data presented lend themselves to a discussion of a preventive nature since, from a comparison of the data before and after modification, the efficacy of the modification itself is evaluated. The efficacy may vary from simple maintenance of equipment to environmental purification procedures and necessity of applying corrective modifications directly by the raw materials.