What is photochemical smog and how is it formed?

What is photochemical smog and how is it formed?

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. Primary pollutants.

What is smog PPT?

Smog is a kind of intense air pollution, originally named for the mixture of smoke and fog in the air. Major cities around the world are experiencing the effects of air pollution. Read more. Prashant Mehta. Consultant, Marketing Professional, and Academician at National Law University.

What are the steps involved in the formation of 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. VOCs are released from gasoline, paints, and many cleaning solvents.

What is photochemical smog equation?

Composition of Photochemical Smog NO2+hν→NO+O. 2. The oxygen radical then reacts with an atmospheric oxygen molecule to create ozone, O3: O. +O2→O3.

What are essential for the formation of photochemical smog?

The formation of photochemical smog consists of three main ingredients. Moreover, these ingredients are nitrogen oxides, hydrocarbons, and sunlight.

What are four things required for photochemical smog formation?

Warmth, ample sunlight, and a relatively little movement of air so that the reactants are not diluted are also required. The major undesirable components of photochemical smog are nitrogen dioxide (NO2), ozone (O3), PAN (peroxyacetylnitrate), and chemical compounds that contain the –CHO group (aldehydes).

Why photochemical smog is called so?

‘Photochemical smog’ is so-called because it is formed as a result of a photochemical reaction (i.e. in presence of sunlight) between oxides of nitrogen and hydrocarbons.

What is photochemical smog and its effects?

Photochemical smog is created by the interaction of sunlight with certain atmospheric chemicals. Ozone is the principal component of air pollution of this kind. Ozone in the stratosphere protects us from harmful ultraviolet radiation but it is detrimental to human health when it is present on the ground level.

What is another name for photochemical smog?

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 ingredient in photochemical smog?

The main components of photochemical smog are nitrogen oxides, Volatile Organic Compounds (VOCs), tropospheric ozone, and PAN (peroxyacytyl nitrate).

Which of the following factors contribute to formation of photochemical smog?

Smog is formed by the photochemical reaction of automobile exhaust and atmospheric air in presence of sunlight, NO2 decomposes into NO and monoatomic oxygen.

Which of the following is produced during the formation of photochemical smog?

Notes: During the photochemical smog NO and O3 both are produced but major production is of nitrogen oxide (NO) and NO2. The components of automobile exhaust are particularly important in the formation of atmospheric ozone and are the primary contributors to Los Angeles smog.