Toxic air pollutants--assessing their importance.

Toxic air pollutants (TAP) are a major concern for air pollution scientists, yet our state of knowledge concerning these contaminants is not comprehensive. The paper that follows contains a critical analysis of various aspects of TAP such as regulatory controls, sources, atmospheric concentrations and health impacts. Throughout the discussion specific examples are used to illustrate particular points, and while a large body of information is referenced, the literature review is not meant to be exhaustive. Toxic air pollutants present a challenge to the air pollution scientist; the true significance of these environmental contaminants on human health has not yet been quantified, although certain studies appear to indicate that they may have important impacts on respiratory health.