Exposure to nitric oxides may cause an inflammation of the respiratory tracts. Particulate matter is a term referring to solid particles and liquid droplets found in the atmospheric air. Primary particles may be natural, originating from soil dust and sea spray. They can be industrial and transportation-related as well when their sources are metallurgical processes or exhausts and tire breaks. A secondary pollutant is an air pollutant formed in the atmosphere as a result of the chemical or the physical interactions between the primary pollutants themselves or between the primary pollutants and other atmospheric components.
Major examples of secondary pollutants are photochemical oxidants and secondary particulate matter. Photochemical oxidants result from the photochemical reactions involving sunlight with nitrogen oxides, sulfur dioxide, or volatile organic compounds.
They include acids, nitrogen dioxide, sulfur trioxide, and ozone. Ozone is considered a highly dangerous air pollutant. Exposure to ozone can cause many lung diseases such as asthma, emphysema, and bronchitis. Repeated and long exposures to ozone may even permanently scar the lung tissue. Secondary particles are the result of the condensation of gases, the chemical reactions involving primary particles with gases, and the coagulation of various primary particles.
The main primary pollutants involved in the formation of secondary particulate matter are sulfur dioxide and nitrogen oxides.
Examples of secondary pollutants include photochemical oxidants ozone, nitrogen dioxide, sulfur trioxide and secondary particulate matter. Primary pollutants are considered chemical reactants, being involved in the chemical reactions that result in the formation of secondary pollutants. Therefore, their pollution effect can either be direct like the impact of sulfur dioxide on the human respiratory system or indirect when sulfur dioxide interacts with water in the atmosphere to form acid rain, with serious consequences on the ecosystem.
On the other hand, secondary pollutants are chemical products inferring that they might be more stable and inert with a limited polluting effect. While this might be true to some extent, it is not the case of ozone where photoactivation is involved, making the chemical process highly reactive. The atmospheric concentration of primary pollutants can be controlled in a direct way through the reduction of anthropogenic emissions.
On the contrary, controlling the secondary pollutants is a much more complicated process: the chemical reactions involved in their formation must be understood and interrupted.
Primary and secondary pollutants are two groups of air polluting substances differing mainly by their sources of emission or generation. This process makes the chemical reaction extremely reactive. Thus, in case of ozone O 3 , the effect is not limited. The main source of secondary pollutants is primary pollutants and secondary pollutants are formed as a result of chemical reaction between primary pollutants and with other atmospheric particles.
Thus, it is a challenging task to control the production or emission of secondary pollutants since it involves understanding the complicated process of its creation. Few examples of secondary pollutants are as follows: —. Air pollution is caused by mainly two types of pollutants: — Primary and secondary pollutants. While both these pollutants contaminate the atmosphere, there are certain differences between them. The main difference between them is their source.
While the former is emitted directly into the air, the latter is a product of two primary pollutants or a primary pollutant and any atmospheric particle. Other differences involve their effect, form, examples and how to control them. No matter how many differences, it is important to take adequate measures to keep both the pollutants in check and to keep our environment clean!
Skip to content Pollution is one trouble that almost all countries are facing in different intensities. Secondary pollutants are pollutants formed either due to a reaction between primary pollutants themselves or between a primary pollutant and any other atmospheric particle. Primary pollutants affect both directly and indirectly, through impacting the atmosphere and through the secondary pollutants respectively. Greywater : All you need to know.
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