O, SO 2 gases are then blown out the stack of the plant. O, SO 2 gases. The source of SO 2 pollution is primarily from the combustion of coal during the production of electricity. The primary source of CO and CO 2 pollution is from the combustion of gasoline in automobiles. CO emissions from autos have been reduced in recent years by the use of catalytic converters.
Autos are also responsible for the NOx air pollutants.
These are also contributors to acid rain and are also quite toxic. The nitrogen comes from the air intake into the combustion reaction. A photochemical reaction that occurs only in the presence of light. Deadly Smog was produced in London 1952 and Pennsylvania 1948 caused by a thermal inversion which trapped the smog close to the ground. The smog was comprised of sulfuric acid containing water droplets, which were produced as a result of the catalysis of the reaction of the sulfur dioxide to sulfur trioxide in the presence of fine ash particles.