Protection of man - assessment of substances

The exposure of public to toxic substances in the air is subject to permane nt changes which reflects the quantitative and qualitative development of t he industrial and commercial structure as well as the increasing influence of nonstationary (traffic caused) emission sources. At the same time the la test scientific data lead to a change in toxicological judgement, The prese nted paper gives an account of the general principles of assessment in envi ronmental toxicology and corresponding legal topics, Exemplified by the dif ficulties in determinating the exposure of the general population to partic ulate matter these problems ave discussed.