[Impact of atmospheric pollution on the lung].

Longitudinal studies on the effects of atmospheric pollutants on the respiratory system have yielded conflicting conclusions. Socio-economic situation, cigarette smoking and chronic diseases must be taken in account in this multifactorial problem. Nevertheless, evidence has been accumulating that exposure brings a consistent rise in the frequency of chest conditions. Although current levels of pollution are apparently tolerable, unusual weather variations may result in a disquieting situation with ultimately increasing morbidity and mortality rates. Limit levels of pollutant concentration have to be respected since air quality standards adequately protect against adverse health effects, at least in high risk populations.