Contents
Where is photochemical smog found?
Secondary pollutants, like ozone, result from the reaction of primary pollutants with ultraviolet light. Photochemical smog is most common in sunny and dry cities, like Los Angeles. Smog has a variety of negative health impacts.
Where and why is photochemical smog usually found?
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.
Why does photochemical smog occur in the Los Angeles basin?
Secondary pollutants, such as ozone, are formed when primary pollutants undergo chemical reactions in the atmosphere. Photochemical smog, as found for example in Los Angeles, is a type of air pollution derived from vehicular emission from internal combustion engines and industrial fumes.
What are the conditions for photochemical smog?
Photochemical smog happens when nitrogen oxides and volatile organic compounds react together in the presence of sunlight as a catalyst and form ozone at lower levels. The nitrogen oxides come from vehicle exhausts, and volatile organic compounds come from many chemicals, such as paint and cleaning agents.
What is the main source 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. VOCs are released from gasoline, paints, and many cleaning solvents.
Which of the following is not present in photochemical smog?
Among the given chlorofluorocarbons are the compounds that are responsible for ozone depletion which degrades ozone into molecular oxygen. It is not a component of photochemical smog.
When does photochemical smog occur in the air?
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.
Where does photochemical smog take place in India?
Sunlight is a must for photochemical smog to take place. It is most common in Northern states of India such as Delhi, Punjab and Haryana, where farmers burn their ground after the harvesting season is done. 1. What are the causes of photochemical smog?
Why does smog occur more often in the summer?
It tends to occur more often in summer, because that is when we have the most sunlight. Primary pollutants The two major primary pollutants, nitrogen oxides and VOCs, combine to change in sunlight in a series of chemical reactions, outlined below, to create what are known as secondary pollutants. Secondary pollutants
How are no 2 molecules involved in smog?
When it is exposed to ultraviolet radiation, the NO 2 molecule is known to undergo a complex series of hydrocarbon reactions to produce the photochemical smog components. These components include a mixture of ozone, aldehydes, nitric acid, peroxyacyl nitrates (abbreviation: PANs) and many other secondary pollutants.