What Are Secondary Pollutants

What are secondary pollutants examples?

Examples of a secondary pollutant include ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight; NO2, which is formed as NO combines with oxygen in the air; and acid rain, which is formed when sulfur dioxide or nitrogen oxides react with water.

What is the definition of a secondary air pollutant?

Secondary air pollution is pollution caused by reactions in air already polluted by primary emissions (from factories, automobiles and so forth). An example of secondary air pollution is photochemical smog.

What are examples of primary and secondary pollutants?

Primary pollutants include ammonia, sulfur dioxide, nitrogen dioxide and carbon monoxide. Secondary pollutants include ground-level ozone, acid rain and nutrient enrichment compounds.

Which is not secondary pollutant?

Smog is not a secondary pollutant. Smog is air pollution that reduces visibility.

What do primary and secondary pollutants mean explain with examples Class 11?

(i) Primary pollutants These are present in same form in which these are added by man e.g., DDT. pesticides. fertilizers etc. (ii) Secondary pollutants These occur in different forms and are formed by the reaction between the primary pollutants in the presence of sunlight e.g., HNO3, H2SO4 PAN, ozone etc.

Is co2 a secondary pollutant?

Carbon Monoxide (CO)

Carbon monoxide is released from volcanoes and forest fires as well. Secondary pollutants like ozone and carbon dioxide (CO2), a greenhouse gas, come from carbon monoxide.

Is smog a secondary pollutant?

An important secondary pollutant for photochemical smog is ozone, which is formed when hydrocarbons (HC) and nitrogen oxides (NOx) combine in the presence of sunlight; nitrogen dioxide (NO2), which is formed as nitric oxide (NO) combines with oxygen (O2) in the air.

Which is the major photochemical smog?

Ground-level ozone constitutes one of the major components of photochemical smog, so called because of the photochemical reaction of air pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) with ultraviolet light (sunlight); thus, the O3 levels vary strongly with season and the highest levels

Why is ozone a secondary pollutant?

Ground-level ozone is a colorless and highly irritating gas that forms just above the earth's surface. It is called a "secondary" pollutant because it is produced when two primary pollutants react in sunlight and stagnant air. These two primary pollutants are nitrogen oxides (NOx) and volatile organic compounds (VOCs).

Which of the following would be best defined as a secondary pollutant?

A secondary pollutant is the product of a primary pollutant already present in the atmosphere that has reacted with another substance in the open air. "Ozone" is a secondary pollutant because it is a product of hydrocarbons and nitrogen oxides (i.e. primary pollutants) that have reacted with one another in sunlight.

Which of the following is called secondary air pollutants?

3. Which of the following is called the secondary air pollutant? Sol: (b) Ozone.

What are the difference between primary and secondary air pollutants?

Primary pollutants are pollutants that are emitted from a source, directly into the atmosphere. Secondary pollutants are pollutants formed either due to a reaction between primary pollutants themselves or between a primary pollutant and any other atmospheric particle.

What are examples of primary pollutants?

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.

What are the sources of primary and secondary air pollutants?

A primary source results from the direct emissions from an air pollution source. In contrast, a secondary source results from the formation of a pollutant in the atmosphere from the chemical reaction of precursors emitted from air pollution sources.

Is SPM is a secondary air pollutant?

Air borne emissions emitted from various industries are a cause of major concern. These emissions are of two forms, viz. solid particles (SPM) and gaseous emissions. Most important secondary level Air Pollutants are Ground Level Ozone, Smog and POPs (Persistent Organic Pollutants).

Which of the following pollutant is secondary pollutant?

Examples of secondary pollutants are Ozone, Formaldehyde, PAN (peroxy acetyl nitrate) and Smog etc.

What are primary and secondary pollutants Class 12?

Hint: To answer this question you should know that a primary pollutant is an air pollutant emitted from a source directly into the atmosphere and a secondary pollutant is an air pollutant formed in the atmosphere as a result of interactions between the primary pollutants and other atmospheric components.

Which of the following is a second pollutant?

O3 (ozone) is a secondary pollutant.

Is Nox a primary pollutant?

Primary pollutants are any type of pollutant directly into the environment. They differ from secondary pollutants because secondary pollutants must form in the atmosphere, whereas primary pollutants do not. Types of primary pollutants include: Nitrogen oxides (NOx)

Is Mercury a primary or secondary pollutant?

Primary pollutants come directly from sources such as industrial facilities, automobiles and forest fires. These include sulfur and nitrogen compounds, particulate matter, volatile organic compounds such as paint fumes and solvents, and toxic metals such as mercury.

Is sulfuric acid a secondary pollutant?

Types of Secondary Pollutants

Primary pollutants include carbon monoxide (CO). Secondary pollutants include Sulfuric acid (H2SO4) which can cause respiratory problems. Nitrogen dioxide (NO2) which gives air a brownish coloration.

Which of the following is an example of photochemical pollutant?

Air pollution containing ozone and other reactive chemical compounds formed by the action of sunlight on nitrogen oxides and hydrocarbons, especially those in automobile exhaust.

What are photochemical pollutants?

Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities. It tends to occur more often in summer, because that is when we have the most sunlight.

Which pollutants is the major contributor to photochemical smog?

Option 2 is the correct answer: Ozone is the major contributor to photochemical smog.

Is photochemical smog a primary pollutant?

Photochemical smog is composed of primary and secondary pollutants. Primary pollutants, which include nitrogen oxides and volatile organic compounds, are introduced into the atmosphere via vehicular emissions and industrial processes. Photochemical smog is most common in sunny and dry cities, like Los Angeles.

Is carbon monoxide primary or secondary?


Pollutant [links to historical tables of NAAQS reviews] Primary/ Secondary
Carbon Monoxide (CO) primary
Lead (Pb) primary and secondary
Nitrogen Dioxide (NO2) primary
primary and secondary

What are VOCs in air?

Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. VOCs include a variety of chemicals, some of which may have short- and long-term adverse health effects. All of these products can release organic compounds while you are using them, and, to some degree, when they are stored.

Is lead a primary or secondary pollutant?

Primary pollutants include sulphur dioxide, nitrogen oxides, particulate matter, carbon monoxide, lead, and volatile organic compounds. Secondary pollutants are created in the atmosphere when primary pollutants have chemical reactions with each other or other atmospheric compounds, such as water vapour.

Which agent is mainly responsible for the secondary pollutants?

Like nitrogen dioxide, sulfur dioxide can create secondary pollutants once released into the air. Secondary pollutants formed with sulfur dioxide include sulfate aerosols, particulate matter, and acid rain.

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