What is the chemical equation for photochemical smog?
Composition of Photochemical Smog NO2+hν→NO+O. This is a continual cycle that leads only to a temporary increase in net ozone production. To create photochemical smog on the scale observed in Los Angeles, the process must include Volatile organic compounds (VOC’s).
Does methane cause photochemical smog?
They can contribute to the formation of photochemical air pollution, give rise to odour nuisances or simply be hazardous. Usually a distinction is made between methane (CH4) and the other volatile hydrocarbons (NMVOC, nonmethane VOC). Methane is a greenhouse gas, but is chemically not particularly active.
What are the 3 major ingredients of photochemical smog?
The formation of photochemical smog involves three primary ingredients: nitrogen oxides, hydrocarbons and sunlight.
How does NO2 act in formation of photochemical smog?
NO2, ozone and PANs are called photochemical oxidants because they can react and oxidize certain compounds in the atmosphere or within a person’s lungs that are not normally oxidized. Photochemical smog formation; sunlight reacts with NO2 which then interacts with other molecules in the air to form smog.
What is photochemical smog give example?
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.
How is photochemical smog controlled?
Getting regular tune-ups, changing oil on schedule, and inflating tires to the proper level can improve gas mileage and reduce emissions. Fuel up during the cooler hours of the day—night or early morning. This prevents gas fumes from heating up and producing ozone. Avoid products that release high levels of VOCs.
Which is not component of photochemical smog?
The correct answer is Polyaromatic hydrocarbons.
What is the major 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.
Which of the following is not present in photochemical smog?
Hence chlorofluorocarbons are not common component of photochemical smog.
Why is photochemical smog a problem?
The collection of chemicals found in photochemical smog causes problems for plants and animal life. 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.
Where did the term photochemical smog reaction come from?
Photochemical smog reactions. “Smog” is a term originally formed by the combination of of the words “smoke” and “fog.”. This can seem a little confusing, because Los Angeles, infamous for for its smog, is hardly known for foggy weather.
When did the EPA stop using photochemical smog?
EPA 90/04: This document replaces the EPA Information Sheet No. 21, ‘Photochemical Smog’ (August 2000). It explains what photochemical smog is and the dangers it poses to environmental and human health, as well as providing information on how photochemical smog can be reduced.
Where can you find photochemical smog in California?
Photochemical smog can be severe in the Los Angeles basin of the California coast (see Fig. 17.7 ). Commuting in Los Angeles requires many cars, which produce high emissions of NO x and hydrocarbons.
Why are nitrogen oxides important in photochemical smog?
Emissions of nitrogen oxides have been a cause of concern because of their role as primary pollutants in photochemical smog and their contribution to acid wet and dry deposition. Nitrogen oxides are also important because of their indirect effect on climate through their role in affecting global ozone concentrations.