translate English to French: In 1998, the average level of sulphur in Canadian gasoline was 350 parts per million (ppm), among the highest in the industrialized world.
En 1998, la teneur moyenne en soufre dans l'essence canadienne Ã©tait de 350 parties par million (ppm), soit l'une des plus Ã©levÃ©es du monde industrialisÃ©.