>As carbon monoxide is lighter than air Yes, but distance from chimney and lower atmospheric pressure on high altitude matters too: http://en.wikipedia.org/wi

>As carbon monoxide is lighter than air Yes, but distance from chimney and lower atmospheric pressure on high altitude matters too: http://en.wikipedia.org/wiki/Air_pollutant_concentrations#Correcting_concentrations_for_altitude http://en.wikipedia.org/wiki/Air_pollutant_concentrations#Co...