ABSTRACT
In this section, four of the major gaseous air pollutants are considered, that is, sulfur oxides (SOx), nitrogen oxides (NOx), ozone (O3), and carbon monoxide (CO).
8.1 Sulfur Oxides Sulfur oxides include both sulfur dioxide (SO2) and sulfur trioxide (SO3), of which SO2 is more important as an air pollutant. Sulfur trioxide may be formed in the furnace by reaction between sulfur and O2, or SO2 and O2. Sulfur dioxide is probably the most dangerous of all gaseous pollutants on the basis of amounts emitted.
