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THE polycyclic hydrocarbon content of air may be determined by analysis of smoke which is collected usually by filtration. When ambient atmospheres are sampled it is tacitly assumed that the sought hydrocarbons are present only in the solid phase and are not appreciably volatile at the temperature of the filter. In the course of recent work on air pollution by vehicle exhausts (Commins, Waller and Lawther, 1957), filters used to collect smoke in track and bench tests became hot and this observation indicated the urgent need to examine the validity of this method of sampling. In the investigation reported here 3,4-benzpyrene was the only hydrocarbon considered.

Volatility of 3,4-Benzpyrene in Relation to the Collection of Smoke Samples