Mitigating Crystalline Silica Exposure in the Work Place

PSAC has compiled several resources to inform the petroleum services sector about workers’ risks in regard to crystalline silica. Workers who are transporting, storing and handling sand are at risk of exposure above the exposure limit. Employers are required to have an Exposure Control Plan in place when workers have the potential to be exposed to silica.

Exposure control as per Western Canada Provincial regulations:

Saskatchewan: Part 6. General Health Requirements 85 (1) Exposure control plan 

Alberta: Part 4, Section 16 – Worker exposure to harmful substances 

British Columbia: Part 5. Controlling Exposure 5.54 Exposure control plan 

Manitoba: Part 36. Chemical and Biological Substances

Developing a silica exposure control plan



Occupational Exposure Limits (OEL)
Canadian Jurisdictions OEL¹ (mg/m³)
Canada Labour Code 0.025 [r]
BC, AB, MB, NS NL, PE 0.025 [r]
SK 0.05 [r]
NB 0.1 [r]
ON 0.05 [cristobalite]
0.1 [quartz, tripoli]
QC 0.05 [r, cristobalite, tridymite]
0.1 [r, quartz, tripoli]
YT 300 particles/mL² [quartz]
150 [cristobalite]
Other Jurisdiction OEL (mg/m³)
ACGIH 2011 TLV 0.025 [r]












The Enform website has a variety of publications containing details on worker exposure to crystalline silica.