I always test for CO, and have personally found CO in my tank(s), or have been poisoned by CO.
I always test for CO, but have not personally found a reading, or experienced CO poisoning.
I always test , haven't had a reading, but know someone that has found CO or experienced CO.
I always test for CO, haven't had a reading, but have heard of found or experienced CO.
I don't test for CO; I personally know someone that found or experienced CO.
I don't test for CO, but the station has a CO tester and I've seen it.
I don't test for CO; I fill my own and test for CO, or just trust my fills.
I don't test for CO, I've not heard of it around here and don't believe it is an issue.
Other
There was a car running in front of the air intake of the compressor. The gas blender relied on the CO filter, which unfortunately has a very limited capacity. Some of us got a 21/35/10ppm quadmix. Noticed it by chance mere minutes prior to the dive because one of us happened to carry a CO analyzer. No experience with CO under water.
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