Photochemical Smog
Chemistry ⇒ Environmental Chemistry
Photochemical Smog starts at 10 and continues till grade 12.
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See sample questions for grade 10
Describe one reason why children and elderly people are more affected by photochemical smog.
Describe one way in which photochemical smog can be reduced in cities.
Describe the difference between primary and secondary pollutants in the context of photochemical smog.
Describe the role of volatile organic compounds (VOCs) in the formation of photochemical smog.
Explain how temperature inversions can worsen photochemical smog.
Explain the environmental impact of photochemical smog on plants.
Explain the role of sunlight in the formation of photochemical smog.
Explain why photochemical smog is less common in rural areas than in urban areas.
Explain why photochemical smog is more severe in the afternoon than in the morning.
Explain why photochemical smog is sometimes called 'summer smog'.
List two main sources of nitrogen oxides (NOₓ) in urban areas.
Name one secondary pollutant other than ozone that is formed in photochemical smog.
Name two health effects caused by exposure to photochemical smog.
What is photochemical smog?
A city experiences a sudden increase in photochemical smog levels during a week of unusually high temperatures and little wind. Explain, with reasons, how these weather conditions contribute to the smog episode.
Describe how the use of electric vehicles can help reduce the formation of photochemical smog. Include the chemical reasoning in your answer.
Explain why reducing the use of fossil fuels in power plants can decrease the occurrence of photochemical smog in urban areas.
Explain, using chemical equations, how nitrogen dioxide (NO2) leads to the formation of ozone (O3) in the lower atmosphere during photochemical smog formation.
