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It's common to confuse these terms, so to prevent additional confusion...I think you have misread the article. Carbon Dioxide is found in air typically as a result of a faulty filtration system, or faulty compressor. The average Joe has little ability to test for this, unless he acquires a CO analyzer... and they aren't cheap. I have an Analox unit and I think it cost about $500.
I don't test my tanks for CO when I get my gas from my usual shop since he has an inline CO monitor and I am typically standing there while my tanks are filling. I do however, take the thing (along with my Nitrox analyzer) whenever I go away and get gas from an unfamiliar shop.
Carbon Dioxide or CO2 is not much of a risk
Carbon Monoxide or CO is the risk we're discussing.
I think the Analox portable EII CO Carbon Monoxide Analyzer tester runs around $350 USD, altho I see a Sears store wanting $580?! Do they cost more up there?