English Abstract In a previous study preliminary Maximum Permissible
Concentrations (MPC) in air are derived for 22 volatile compounds. The
present study is performed as a supplement to the derivation of preliminary
MPC values, which was based on informtion from reviews only. The data
obtained from reviews are re-evaluated by studying the original literature
and supplemented with recent data from on-line search. The final data set
is evaluated for each compound to determine whether or not a MPC in air can
be derived. For 3-chloro-1-propene, 1,1-dichloroethene,
1,2-dichloropropane, 1,3-dichloropropene, and 1,1,1-trichloroethane a MPC in
air is derived, while for 2-chloro-1,3-butadiene the preliminary MPC is
revised. For the remaining 16 compounds essential human toxicological data
are lacking. The derived MPC's are: 7.4 mug/m3 for 3-chloro-1-propene, 200
mug/m3 for 1,1-dichloroethene 12.4 mug/m3 for 1,2-dichloropropane, 40
mug/m3 for 1,3-dichloropropene and 4,820 mug/m3 for 1,1,1-trichloroethane.
For 2-chloro-1,3-butadiene a preliminary MPC was set at 1
mug.m3
