photochemical smog is formed when primary pollutants interact with

Photochemical Smog Is Formed When Primary Pollutants Interact With?

nitrogen oxides

What three primary pollutants are involved with photochemical smog?

Among the pollutants involved in photochemical smogs are ozone, nitrogen dioxide and peroxyacyl nitrate (PAN). The nitrogen dioxide, and other oxides of nitrogen, are primary pollutants produced by dissociation in combustion reactions, and both ‘prompt’ and ‘thermal’ NOx can be involved in the reactions.

What causes the photochemical smog?

Photochemical smog is produced when sunlight reacts with nitrogen oxides and at least one volatile organic compound (VOC) in the atmosphere. … When sunlight hits these chemicals, they form airborne particles and ground-level ozone—or smog.

What is necessary for photochemical smog to form?

The formation of photochemical smog involves three primary ingredients: nitrogen oxides, hydrocarbons and sunlight. … Sunlight causes the photodissociation of nitrogen and oxygen to yield ozone and oxygen atoms.

What is photochemical smog how is it formed and how does it effect?

Photochemical smog refers to a type of smog which is formed when the ultraviolet light from the sun reacts with nitrogen oxides present in the atmosphere. This smog can cause a lot of adverse effects on humans and other living organisms.

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.

Why is photochemical 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.

Where does photochemical smog occur?

Photochemical smog, which is also known as “Los Angeles smog,” occurs most prominently in urban areas that have large numbers of automobiles. It requires neither smoke nor fog. This type of smog has its origin in the nitrogen oxides and hydrocarbon vapours emitted by automobiles…

What is the main source of photochemical smog quizlet?

Photochemical smog is caused by nitrogen oxides combing with sunlight and other pollutants. Acid rain is caused by sulfur oxides and nitrogen oxides combining with water.

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How photochemical is formed?

Photochemical form is formed by a complex series of chemical reactions involving sunlight, oxides of nitrogen, and volatile organic compounds that are present in the atmosphere as a result of air pollution. These reactions often result in the formation of ground level ozone and certain airborne particles.

How is photochemical smog formed quizlet?

Photochemical smog is formed when nitrogen oxides (NOx) and volatile organic hydrocarbons react when activated by sunlight. … 3) When exposed to UV radiation from the sun, some NO2 reacts with hydrocarbons to form photochemical oxidants such as ozone, nitric acid, aldehydes and other pollutants.

Is formaldehyde a component of photochemical smog?

The common components of photochemical smog are ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate (PAN).

What is photochemical smog What are the major pollutants responsible for photochemical smog formation describe the chemical reactions for formation of pan?

What is photochemical smog? 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.

What are the effects of photochemical smog How can photochemical smog be controlled?


Photochemical smog is obtained from the burning of fossil fuels and automobile fuels that emit NO2 and hydrocarbons, which in turn form ozone, PAN, and other chemicals. To prevent the release of NO2 and hydrocarbons into the atmosphere, the use of catalytic converters in automobiles is recommended.

How is smog different from photochemical smog?

Sulfurous smog, also known as London smog, develops due to high concentration of sulfur oxides in the air. … Photochemical smog is produced when sunlight reacts with oxides of nitrogen and at least one volatile organic compound (VOC) in the atmosphere.

photochemical smog is formed when primary pollutants interact with
photochemical smog is formed when primary pollutants interact with

What is industrial smog vs photochemical smog?

It is produced when nitrogen oxides and volatile organic compounds in automobile and fossil-fueled power-plant emissions combine with oxygen in the air in direct sunlight. Whereas industrial smog casts a gray pallor over the areas it affects, the nitrogen dioxide in photochemical smog creates a dingy, brownish haze.

What is industrial photochemical smog?

Both industrial smog and photochemical smog are forms of air pollution. … Industrial smog typically exists in urban areas where factories burn fossil fuels such as coal, which creates smoke and sulfur dioxide that mix with fog droplets to create a thick blanket of haze close to the ground.

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What is smog is it a primary or secondary pollutant?

Smog. Another most important secondary pollutant is the Smog, which has made up of Smoke and Fog.

What is photochemical smog quizlet?

– Photochemical smog is a yellow-brown haze due to nitrogen dioxide. – The presence of this gas and other pollutants can cause health problems. Formation of nitrogen oxides. – Nitrogen oxides are formed in high temperature engines and furnaces.

What contributes to both photochemical smog and acid precipitation?

Smog and acid rain are produced through similar sources, primarily vehicle and industry emissions. Though both result from human-caused air pollutants, there are chemical distinctions between the two.

Which is a major source of pollution quizlet?

Terms in this set (30) Most air pollution comes from motor vehicles and industry. Smog results from chemical reactions that involve sunlight, air, automobile exhaust, and ozone.

What is called photochemical smog?

Photochemical smog is a type of smog produced when ultraviolet light from the sun reacts with nitrogen oxides in the atmosphere. It is visible as a brown haze, and is most prominent during the morning and afternoon, especially in densely populated, warm cities.

How is photochemical smog formed apes?

Photochemical smog (brown smog) is formed by the reaction of nitrogen oxides and VOCs with tropospheric ozone. … Sunlight breaks a bond and releases one oxygen forming nitrogen oxide (NO). The lone oxygen then bonds to atmospheric oxygen (O2) with the assistance of sunlight. This forms tropospheric ozone (O3).

Which of the following is a primary pollutant quizlet?

The five primary air pollutants include carbon monoxide, nitrogen oxides, particulate matter, sulfur oxides, and volatile organic compounds. The sources for all five of these pollutants include electricity production, industry, and transportation.

What is smog quizlet?

-Smog: a poisonous mixture of smoke, aire, and other pollutants. -need: emissions, warmth/sunlight, and no air movement.

What are the 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 is the effects of photochemical smog?

Ozone and nitric oxide (NO) can irritate the nose and throat and their high concentration causes a headache, chest pain, dryness of the throat, cough and difficulty in breathing. Photochemical smog leads to cracking of rubber and extensive damage to plant life.

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Which of the following can control the photochemical smog?

Solution : [c] Usually catalytic converters are used in the automobiles, which prevent the release of nitrogen oxide and hydrocarbons to the atmosphere. Certain plants e.g., Pinus, Juniparus. Quercus, Pyrus and Vitis can metabolise nitrogen oxide and therefore, their plantation could help in this matter.

What is the effect of photochemical smog on plants?

Ozone and peroxyacetyl nitrate that travel close to the ground as a result of smog can have damaging effects on plants, resulting in the discoloration and damage to plants. This reduces the amount of photosynthesis that these plants can engage in, according to the University of California.

How are solid particulates formed?

1.2 How are particles formed? Coarse particles are produced by the mechanical break-up of larger solid particles. The coarse fraction can include dust from roads, agricultural processes, uncovered soil or mining operations, as well as non-combustible materials released when burning fossil fuels.

Why secondary pollutants are more harmful than primary?

Secondary pollutants are more harmful than primary pollutants because the harmful gases produced by primary pollutants like carbon monoxide can result in air pollution in the atmosphere. … Secondary pollutants can result in Acid deposition.

What is ozone and how does it form as part of photochemical smog?

Ozone is a secondary pollutant that forms from the primary pollutants such as Volatile Organic Compounds (Hydrocarbons) and nitrogen oxides (NOx) in the presence of sunlight. Its formation is mainly from the automobile emissions.

Photochemical Smog (Animation)

The science of smog – Kim Preshoff

Lecture 3.2 Photochemical Smog


SMOG | Photochemical Smog | Classical Smog | Air Pollution | Environmental Science | NTA UGC NET |

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