Sulfurous smog.
Sulfurous smog (London smog) This type of air pollution emerges as a result of burning coal, the accumulation of particulate matter from industrial activity and a drop in temperature. The polluting particles mix with the cold air to form a thick fog that significantly worsens overall air quality.
Is London smog The photochemical smog?
At least two distinct types of smog are recognized: sulfurous smog and photochemical smog. Sulfurous smog, which is also called “London smog,” results from a high concentration of sulfur oxides in the air and is caused by the use of sulfur-bearing fossil fuels, particularly coal.
What is London smog and LA smog?
The London-smog mostly occurring in the winter months consists of a mixture of gaseous and solid aerosoles as well as of natural fog. The Los Angeles-smog, which is relatively dry, is formed only during sunny sommerdays by photo chemical process.
What are the types of photochemical smog?
Common examples of primary pollutants that contribute towards photochemical smog include oxides of nitrogen such as nitric oxide, nitrogen dioxide, and nitrous oxide and most VOCs (volatile organic compounds).
How is smog formed in London?
A period of cold weather, combined with an anticyclone and windless conditions, collected airborne pollutants mostly from the use of coal to form a thick layer of smog over the city. It lasted from Friday 5 to Tuesday 9 December 1952 and then dispersed quickly after a change of weather.
Is London smog oxidising or reducing?
Photochemical smog is oxidising in nature. And London smog is reducing in nature. Thus, the statement ‘London smog is oxidising in nature’ is false.
Why is London smog called reducing smog?
This smog is formed by the mixture of smoke, fog, and sulfur dioxide. This smog also acts as a reducing agent in atmospheric pollution. Therefore, it is also known as reducing smog.
Is Los Angeles smog A photochemical smog?
Photochemical smog was first identified in Los Angeles in 1944. Although several other kinds of smog occur, photochemical smog (or Los Angeles-type smog) is a yellow-brown haze produced by the reaction of sunlight with exhaust from automobiles and power plants that burn coal.
Why is La prone smog?
Constant vehicle traffic on LA and Long Beach freeways, in the ports, and in the skies all contribute to ozone-layer depletion and smog formation. The Los Angeles area is also home to more than its fair share of refineries and industrial facilities, which contribute to air pollution.
Is London smog 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. Source: GreenFacts.
Which is the major 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). PAN and aldehydes can cause eye irritation and plant damage if their concentrations are sufficiently high.
Is photochemical smog an oxidising smog?
Oxidation: Photochemical smog is also referred to as oxidizing smog.
What are the three other names for photochemical smog?
Synonyms
- exhaust fumes.
- pollution.
- fog.
- haze.
- vapour.
- pea-souper.
What chemicals were in the London smog?
Burning coal releases sulfur dioxide and nitrogen dioxide, which interacted in the water droplets common in the London skies. Initially, the water particles in the fog were large enough to dilute the acid, forming a near neutral fog.
Which smog is reducing?
classical smog
Photochemical smog occurs in warm dry and sunny climate. Photochemical smog is an oxidizing smog whereas classical smog is an reducing smog.
What is oxidizing and reducing smog?
Photochemical smog is sometimes called as Oxidizing smog as it contains high concentrations of oxidizing agens like Ozone, HNO3 whereas Classical Smog is called reducing smog as it contains high concentrations of sulphur dioxide, which is a reducing agent.
What is oxidizing smog?
Oxidizing smogs form when those emitted (or primary) pollutants are transformed through photochemical reactions into secondary pollutants, the most important of which are the strong oxidant gases, ozone and peroxyacetyl nitrate.
What is the difference between classical smog and photochemical smog?
The key difference between classical smog and photochemical smog is that classical smog forms due to humid climate, whereas photochemical smog forms due to smoke coming from automobiles and factories. The term smog can be described as fog or haze intensified by smoke or other atmospheric pollutants.
Which city has the most photochemical smog?
No. 1: Los Angeles. 2021’s smog capital is the Los Angeles-Long Beach metro area, home to 18.7 million people.
Where is photochemical smog common?
Photochemical smog typically occurs and is most visible in the morning and afternoon in cities with a dense population and warm weather, like Los Angeles. Other cities, such as Mexico City, Beijing, and Sydney share the same characteristics and also experience photochemical smog.
Is co2 a photochemical smog?
Photochemical smog only occurs in presence of sunlight. Carbon dioxide is a greenhouse gas and hence it’s concentration in atmosphere does not increase the smog.