Specifications

23
7.0 CONCLUSIONS
Formaldehyde:
• Although worker exposure to formaldehyde in the dirty core area did not exceed WCB of BC
exposure limits, exposures must be maintained at levels as low as reasonably achievable
below the exposure limit (designated as a suspected human carcinogen).
Nitrous oxide:
• Average exposures were below the 12 hr limit of 12.5 ppm with the exception of one nurse
• 5 nurses’ personal data logged samples exceed the 5X excursion limit of 125 ppm.
• The limit set by the WCB of BC of an 8 hour TWA of 25 ppm is attainable at this point in
labour and delivery, where nitrous oxide is self-administered, but the 5X excursion limit of
125 ppm is not.