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 required for the formation of photochemical smog?
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 are the components of photochemical smog?
The major undesirable components of photochemical smog are nitrogen dioxide (NO2), ozone (O3), PAN (peroxyacetylnitrate), and chemical compounds that contain the –CHO group (aldehydes).
What are the 3 major ingredients of photochemical smog?
The main components of photochemical smog are nitrogen oxides, Volatile Organic Compounds (VOCs), tropospheric ozone, and PAN (peroxyacytyl nitrate). All of these substances are very chemically reactive and are irritating to humans and other living things.What factors are required to form 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.
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.
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.
What is the main source of pollutants in photochemical smog?
Photochemical smog is a mixture of about one hundred primary and secondary pollutants formed under the influence of sunlight. Ozone is the main pollutant.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 photochemical smog and 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.
Article first time published onWhat 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.
How does photochemical smog affect the environment?
Photochemical smog has devastating effects on the environment. … Some plants such as tobacco, tomato and spinach are highly responsive to ozone, so photochemical smog can decimate these sensitive crops, trees and other vegetation. Ozone causes necrotic (dead) patterns on the upper surfaces of the leaves of trees.
What are 2 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.
How is smog formed Class 9?
Smog is formed when there is heavy auto mobile exhaust and industrial emission. … When the air close to the Earth is cooler than the air above the pollution cannot get dispersed into the atmosphere and smog is formed.
What is the main source of pollutants in photochemical smog quizlet?
Photochemical smog is a mixture of about one hundred primary and secondary pollutants formed under the influence of sunlight. Ozone is the main pollutant. Precipitation cleans the air and winds disperse the smog.
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 smog quizlet?
-Smog: a poisonous mixture of smoke, aire, and other pollutants. -need: emissions, warmth/sunlight, and no air movement.
How are carbon particulates formed?
Incomplete combustion of a hydrocarbon fuel occurs when there is not enough oxygen for complete combustion , caused by a poor supply of air. Less energy is released. Instead of carbon dioxide, you might get carbon monoxide or particulate carbon, known commonly as soot , or a mixture of both.
How is PM10 formed?
Emissions from combustion of gasoline, oil, diesel fuel or wood produce much of the PM2. … PM10 also includes dust from construction sites, landfills and agriculture, wildfires and brush/waste burning, industrial sources, wind-blown dust from open lands, pollen and fragments of bacteria.
What are PM2 5 and PM10?
Particulate matter (PM) includes microscopic matter suspended in air or water. Airborne particles are called aerosols. PM10 includes particles less than 10 µm in diameter, PM2. 5 those less than 2.5 µm.
What are Naaqs why were they created?
They are designed to address visibility, damage to crops, vegetation, buildings, and animals. The EPA established the NAAQS according to Sections 108 and 109 of the U.S. Clean Air Act, which was last amended in 1990.
Which one of the following is a secondary pollutant?
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.
In which decade did upper air balloon observations of temperature?
The 18th and 19th Centuries With the invention of hot air and hydrogen balloons in France in the early 1780’s, scientists ascended aloft taking with them barometers, thermometers, and other instrumentation to investigate the structure and chemistry of the upper-atmosphere.
Which of the following compound contribute to formation of secondary smog?
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.
What is photochemical smog Class 10?
Hint: Photochemical smog, which is often referred to as the summer smog, is the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds that are present in the atmosphere, which leaves airborne particles harmful for the health and ground-level ozone.
How is ozone formed in photochemical smog?
VOCs + NOx = Ozone. These volatile organic compounds react to form ozone only in the presence of sunlight. … And this ozone again reacts with volatile organic compounds to produce photochemical smog.
What is photochemical smog for kids?
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 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.
How is smog formed what are its effects Class 8?
The carbon particles, nitrogen oxides and sulphur dioxide of smoke combine with the condensed water vapour called fog to form smog. Smog causes cough and aggravates (makes worse) asthma and other lung diseases, especially in children.
How is photochemical smog reduced?
Walk or bike to places that are short distances away instead of driving. Combine trips and fill up with gasoline after dark. Reduce electricity usage. Burning coal is the primary source of electrical production, so avoid excessively using electricity.
How is smog formed 12?
Photochemical smog is created when sunlight reacts with nitrogen oxides and at least one volatile organic compound (VOC) in the atmosphere. … Nitrogen oxides are emitted in the atmosphere from automobiles, power plants, factory emissions.
