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I meant in regular, uncompressed, unfiltered natural air. It seems to be backed up as a common value in populated areas by the local governments environmental department
correct, there is always some CO in ambient air, with the specific value dependent on a myriad of factors. That said, because of the dangers of CO at higher partial pressures, we have to be VERY careful which is why we try to filter it all out. Oiled compressors will also generate CO by nature, so what comes into the intake doesn't matter so much since the compressor will increase the CO concentration to dangerous levels and must be taken out.