Welding Fume and Isocyanates Are the Two to Watch
If you weld, your people are breathing metal fume - and depending on the process and the base metal, that can include manganese, hexavalent chromium and nickel. If you spray two-pack polyurethane coatings, you are working with isocyanates, which are among the most frequently identified causes of occupational asthma anywhere in the industrialised world.
Isocyanate sensitisation is the one that changes a worker's life. Once someone is sensitised, subsequent exposure at levels far below the exposure limit can trigger a reaction. There is no un-sensitising them, and they usually cannot go back on the line.
BC does not require spirometry for any of this - we would rather tell you that plainly than sell you a rule that does not exist. What testing gives you is a baseline before someone starts on the coating line, and a series that catches a developing problem while the worker can still be moved.
We already work in BC manufacturing, including Allmar Inc. in Kelowna and 49th Parallel Coffee Roasters in Burnaby.