Practice question

Which of the following pollutants is the primary cause of photochemical smog in urban areas?

  1. Nitrogen Oxides (NOx) and Volatile Organic Compounds (VOCs)
  2. Carbon Dioxide and Water Vapor
  3. Sulfur Dioxide and Particulate Matter
  4. CFCs and Methane

Answer: A — Nitrogen Oxides (NOx) and Volatile Organic Compounds (VOCs)

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