Table 5

Distribution of exposure concentration estimates as an annual (2000 hour) average and number of individuals exposed by agent among Canadian petroleum workers, 1969–94

AgentIntensity estimates among exposed jobsNo. of employees in cohortNo. (%) of cohort exposed
5th centile25th centile50th centile75th centile95th centile
*μg/m3.
†ppm.
Petroleum coke/spent catalyst*0.030.253.0020.0084.00252852804 (11%)
Hydrocarbon fuels†0.010.301.776.8547.982527911717 (46%)
Hydrogen sulphide†<0.010.010.070.604.762528110577 (42%)
Hydrocarbon lubes*0.121.828.8550.00288.94252859371 (37%)