Topic Overview

A colourless, odourless, non-combustible gas, formula CO2. It is approximately 50% heavier than air, of which it is a normal constituent. It is formed by certain natural processes and by the combustion of fuels containing carbon. Only in the most exceptional circumstances do local concentrations of CO2 in air rise to levels that are dangerous to health, but it plays a significant role in the decay of building stones and in corrosion (WHO, 1980) ...read more