SULPHUR DIOXIDE INJURY TO TREES IN THE VICINITY OF PETROLEUM REFINERIES

Abstract

Damaging concentrations of atmospheric sulphur dioxide have, under favorable environmental conditions, caused severe injury to susceptible trees growing in the vicinity of petroleum refineries located at Clarkson, Ontario and East St. Paul, Manitoba. The damage is described and the factors contributing to recent injury are discussed. Recommendations for correlating tree damage with sulphur dioxide emanations from refineries and for preventing recurrent damages are made.