A substance in the air that can cause harm to humans and the environment is known as an air pollutant. Pollutants can be in the form of solid particles, liquid droplets, or gases. In addition, they may be natural or man-made.
Major primary pollutants produced by human activity include:
- Sulfur Oxides (SOx), this is produced by volcanoes and various industrial processes. Further oxidation of SO2, usually in the presence of a catalyst such as NO2, forms H2SO4, and thus acid rain. This is one of the causes for concern over the environmental impact of the use of these fuels as power sources.
- Nitrogen Oxides(NOx), are emitted from high temperature combustion. This reddish-brown toxic gas has a characteristic sharp, biting odor. NO2 is one of the most prominent air pollutants.
- Carbon Monoxide, It is a product by incomplete combustion of fuel such as natural gas, coal or wood. it's a colourless, odorless, non-irritating but very poisonous gas.
- Carbon Dioxide(CO2) - a colourless, odorless, non-toxic greenhouse gas associated with ocean acidification, emitted from sources such as combustion, cement production, and respiration.
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