Combustion is a fancy name for burning. When you burn a hydrocarbon, you can have complete combustion or incomplete combustion.
Combustion can cause the production of some nasty chemicals.
The internal combustion engine: The combustion of alkanes powers our cars via the internal combustion engine. Common impurities from the internal combustion engine are: Nitrous oxides, Unburned hydrocarbons, and Carbon monoxide. Nitrous oxides react to form ozone at ground level. Ozone irritates eyes and can cause lung damage.
Flue gases: Flue gases are the gases that come out of chimneys. They are also produced as industrial waste. Flue gases often contain sulfur dioxide. Sulfur dioxide dissolves in water to make sulfuric acid. This then falls as acid rain, which destroys trees and vegetation.
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