Which of the following is a secondary pollutant

• Primary air pollutants: Pollutants that are formed and emitted directly from particular sources. Examples are particulates, carbon monoxide, nitrogen oxide, and sulfur oxide. • Secondary air pollutants: Pollutants that are formed in the lower atmosphere by chemical reactions. The two examples are ozone and secondary organic aerosol (haze). • Secondary pollutants are harder to control because they have different ways of synthesizing and the formation are not well understood. They form naturally in the environment and cause problems like photochemical smog. Sources of PM • PM 2.5 (also known as fine fraction particles) is generally defined as those particles with an aerodynamic diameter of 2.5 microns or less. Sources of fine particles include all types of combustion activities (motor vehicles, power plants, wood burning, etc.) and certain industrial processes. • PM 10-2.5(also known as coarse fraction particles) is generally defined as those particles with an aerodynamic diameter greater than 2.5 microns, but equal to or less than a nominal 10 microns. Sources of coarse particles include crushing or grinding operations, and dust from paved or unpaved roads. • Other PM may be formed in the air from the chemical change of gases. They are indirectly formed when gases from burning fuels react with sunlight and water vapor. The sources can be from fuel combustion in motor vehicles, at power plants, and in other industrial processes.

This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer See Answer See Answer done loading Question:Which of the following is considered a secondary pollutant? Carbon monoxide Lead Nitrogen dioxide Carbon dioxide Ozone Sulfur dioxide

46. Match the items given in Column I with those in Column II and select the correct option given below : Column I Column II a Eutrophication i UV-B radiation b Sanitary landfill ii Deforestation c Snow blindness iii Nutrient enrichment d Jhum cultivation iv Waste disposal • a b c d ii i iii iv • a b c d i iii iv ii • a b c d i ii iv iii • a b c d iii iv i ii

Hint: As we know that air pollutants can be solid, liquid or gases. Secondary pollutants are formed in the atmosphere and are not emitted directly from any source such as vehicles or power plants, etc. When the primary pollutants which are formed by the combustion process react in the atmosphere to form secondary pollutants. It blocks the Ultra violet rays which are harmful and are coming directly from the sun. Complete answer: Pollutants which are emitted from any source in the environment are known as primary pollutants. Secondary pollutants are formed in the atmosphere and are not emitted directly from any source such as vehicles or power plants, etc. Secondary pollutants are formed when the primary pollutants which are formed by the combustion process react in the atmosphere and it is harmful for humans. Photochemical smog is made up of secondary pollutants i.e. ozone, nitric acid, etc. Photochemical smog is produced by the interaction of primary pollutants with molecules present in air such as oxygen, hydrocarbons, etc. Secondary pollutants such as: Ozone, Nitrogen oxide, Nitric acid, etc. Option (a)$S$ as it is a secondary pollutant. Note: Air pollutants can be solid, liquid or gases. Secondary pollutants are formed in the atmosphere and are not emitted directly from any source such as vehicles or power plants, etc. Pollutants which are emitted from any source in the environment are known as primary pollutants. Tropospheric ozone is formed by elements such as $CO$, n...