Western Red Cedar Is the Reason
Cedar dust contains plicatic acid, and occupational asthma from western red cedar is one of the best-documented occupational lung diseases in British Columbia. It develops over years of exposure, it does not announce itself early, and in a meaningful share of affected workers the symptoms persist long after exposure ends.
Your crews are also breathing softwood dust, diesel particulate from yard equipment and loaders, and - increasingly - wildfire smoke during the summer season. None of it is acute. All of it accumulates.
There is no section of the BC OHS Regulation that requires spirometry, and we will not pretend otherwise. What a mill gets from testing is this: a baseline that records what a worker's lungs were like before they walked into your green chain, and a series that shows whether anyone is declining faster than age alone explains. Without the baseline, any later decline is presumed to be yours.
We already work in this sector - 45 workers at Sigurdson Forest Products in Chilliwack in a single visit.