CO concentration is usually expressed in volumetric parts per million ('ppm').
There is no 'safe' amount of CO to be exposed to, if you ask me. That is, given the choice, I would rather not be breathing any at all, thanks all the same!
150 ppm is accepted by some as a 'safe' exposure for a limited period of time. Many domestic alarms will sound their warning at this level.
Others go by the level of 40 ppm, and nothing more than that.
There is no 'safe' amount of CO to be exposed to, if you ask me. That is, given the choice, I would rather not be breathing any at all, thanks all the same!
150 ppm is accepted by some as a 'safe' exposure for a limited period of time. Many domestic alarms will sound their warning at this level.
Others go by the level of 40 ppm, and nothing more than that.
As part of the British Standard EN50292, domestic alarms sold in the UK must not sound an alarm below 70 ppm - presumably to prevent 'false' alarms. Most experts would agree that exposure to this amount of CO for any length of time is very unhealthy indeed.
The only sensible approach is the 'ALARA' principle - 'As Low As Reasonably Achievable.' No amount of CO is good.
The only sensible approach is the 'ALARA' principle - 'As Low As Reasonably Achievable.' No amount of CO is good.
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