what causes photochemical smog

What Causes 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. It tends to occur more often in summer, because that is when we have the most sunlight.

What is the main cause of photochemical smog?

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

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

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.

What causes 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. You just studied 13 terms!

What are the three main causes of smog?

Smog is often caused by heavy traffic, high temperatures, sunshine, and calm winds. These are a few of the factors behind an increasing level of air pollution in the atmosphere.

Which gas is formed in 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 environmental factors affect the formation of photochemical smog?

In addition, climatic factors such as rainfall, wind, daily temperature range, and topography have a key role in forming and continuing photochemical smog (9). Smog forming sources, ozone, air pollution, public health, air pollution in Canada and international efforts for decreasing air pollution have been considered.

How is ozone formed in photochemical smog?

VOCs + NOx = Ozone. These volatile organic compounds react to form ozone only in the presence of sunlight. … This blue light is producing the UV light that is required to create ozone. And this ozone again reacts with volatile organic compounds to produce photochemical smog.

Which of the following pollutant is the major contributor to photochemical smog?

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

Which of the following causes the photochemical smog Mcq?

Solution(By Examveda Team)

O3, PAN and NO2 cause photochemical smog.

What are the main causes of smog quizlet?

Smog is mostly caused by action of sunlight on a mixture of hydrocarbons & oxides of Nitrogen. What can Smog cause? According to Conserve-Energy-Future, “it is harmful to humans, animals, plants and nature as a whole. It can also be responsible for pulmonary diseases such as Lung Cancer.”

What causes smog and acid rain?

The pollutants in smog come from vehicle emissions, smokestack emissions, paints, and solvents – most of which started out as crude oil. … The pollutants of acid rain are derived from coal fired power plants.

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.

What are the main causes of smog?

Below are the main causes of smog.

  • Using Coal as a Fuel. …
  • Vehicular and Industrial Emissions. …
  • Overpopulation & Excessive Consumption. …
  • Excessive Waste Production. …
  • Fireworks. …
  • Burning of Agricultural Material. …
  • Construction Activities. …
  • Natural Causes.

What causes industrial smog?

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.

What is the difference between smog and 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.

Does co2 cause photochemical smog?

Carbon monoxide accelerates the reaction as measured by nitric oxide oxidation or ozone formation. This finding has relevance to photochemical smog formation.

What is urbanization contributing to pollution?

The environmental pollution caused by urbanization is mainly due to the effects, such as the increase of urban land use, of the excessive concentration of population [[29], [30], [31]]. The destruction of the environment through economic growth is mainly due to excessive consumption of energy.

What is the main oxidant in photochemical smog?

The photochemical oxidants are secondary air pollutants formed by the action of sunlight on nitrogen oxides and reactive hydrocarbons, their precursors. The most important phytotoxic components produced by these atmospheric photochemical reactions are ozone and peroxyacetyl nitrate.

Which of the following pollutants are responsible for cause of smog?

2. Which of the following pollutants are responsible for the cause of SMOG? Answer: (c) Both incinerators and emissions from vehicles.

Which of the following constituent of photochemical smog causes the bronzing of plants?

Which of the following constituent of photochemical smog causes the bronzing of plants? Explanation: Peroxy-acetyl-nitrate is known to have sever effects on plants and causes it’s surface to bronze and glaze.

Which is the major contributor of carbon monoxide?

Carbon monoxide (CO)—a colorless, odorless, tasteless, and toxic air pollutant—is produced in the incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, coal, and wood. The largest anthropogenic source of CO in the United States is vehicle emissions.

What is the main reason for thermal pollution Mcq?

Explanation: Power plants are the main reasons behind growing thermal pollution. Because power plants use water as a cooling agent for cooling down their machines. This used water is in high temperature and it is released back to the water bodies and cause thermal pollution.

What is the main component of photochemical smog quizlet?

nitrogen oxide (NO) and nitrogen dioxide (NO2) collectively. These gases play a role in photochemical smog. colorless and highly reactive gas; a major component of photochemical smog and also found in the stratosphere where it protects life by filtering out most harmful UV radiation from the sun.

What is the difference between photochemical smog and London type smog quizlet?

What is the difference between photochemical smog and London-type smog? London-style smog was caused by coal that people burned in factories and homes in humid cloudy air. Photochemical smog is found in cities with a lot of sunlight and the is the light particles interacting with the pollution.

What are the causes of air pollution quizlet?

Household products, power plants, and motor vehicles are sources of primary pollutants such as carbon monoxide, nitrogen oxide, sulfur dioxide, and chemicals called volatile organic compounds (VOCs). burning a particularly dirty kind of coal called sea-coal was illegal. vehicles and industry.

Which gas emission from cars causes the formation of acid rain and photochemical smog?

Nitrogen dioxide is produced as a result of road traffic and other fossil fuel combustion processes. Its presence in air contributes to the formation and modification of other air pollutants, such as ozone and particulate matter, and to acid rain.

Which gases causes smog and acid rain?

When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain. The most common nitrogen-related compounds emitted into the air by human activities are collectively referred to as nitrogen oxides.

What happens to smog when it rains?

Rain is nature’s way of rinsing the air of toxic particles. As raindrops fall, they collect molecules floating in the air around them. In the process, a 2015 study in Atmospheric Chemistry and Physics showed, soot and smog are pulled to the ground, and the air is cleaner than it was before.

Which of the following substances are responsible for photochemical smog?

Hydrocarbons, oxides of nitrogen and carbon monoxide are responsible for photochemical smog.

What is greenhouse effect How is smog formed?

Smog is formed by the combination of smoke and fog. It can be caused both by natural means and man-made activities. In general, smog is generally formed by the accumulation of more greenhouse gases including nitrogen and sulfur oxides.

Which of the following is the major photochemical smog?

9. The major photochemical smog is________. Sol: (b) Chlorofluorocarbon.

What is photochemical smog and industrial smog?


what causes photochemical smog



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