[Practical application of a strategy of air sampling at the workplace].

Rhône-Poulenc has defined a sampling strategy of the assessment of exposure levels to toxic chemicals at the workplace by inhalation. This strategy is based on the following principles: 1. The exposure measurements must be carried out on carefully selected "homogeneous exposure groups" (HEG). 2. In order to qualify the exposure levels, the strategy specifies a statistical method for estimating the probability of exceeding the professional exposure limit, for a given HEG. 3. Professional judgement is essential in evaluating the risk of professional exposure.