Sulfur dioxide is a colorless gas with a very stink odors. Sulfurous acids can be further oxided into sulfuric acids and become the major sources of acid rain formation. The formation of nitrogen oxides comes from the combustion process. Nitrogen in the air or in the fuel reacts with oxygen and forms nitrogen oxides. Nitrous oxide is a colorless, odorless gas and slightly dissolves in water.
Nitrous oxide is a colorless, odorless gas and slightly dissolves in water.
Nitrous oxide is the major component of combustion and can become nitrogen dioxide through photochemical reactions. Nitrogen dioxide is a gas with yellowish color and irritating odor. Under the sunlight, nitrogen dioxide can breakdown into nitrous oxide and oxygen by photochemical reactions. The oxidation reactions of nitrogen dioxide in the air are also a source of acid rain formation. In addition to the natural formation of carbon monoxide such as forest fire, methane oxidation, and biological activities, the major sources of carbon monoxide come from incomplete combustion of fossil fuel.