Which condition most commonly causes a sudden increase in surface ozone in urban air?
Correct answer: D. Photochemical reactions involving nitrogen oxides and hydrocarbons
- A. Dissolution of sulphates in groundwater
- B. Direct release of carbon dioxide from deep aquifers
- C. Settling of coarse dust in a storage yard
- D. Photochemical reactions involving nitrogen oxides and hydrocarbons
Explanation
Ground-level ozone forms through sunlight-driven photochemical reactions involving nitrogen oxides and volatile organic compounds. It is therefore a secondary pollutant, not usually emitted directly from a source.
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About Environmental Engineering
Environmental engineering examines water supply, water quality, treatment processes, wastewater collection and treatment, solid waste management, air pollution and public health protection. It covers sedimentation, coagulation, filtration, disinfection, biological treatment and disposal methods, while distinguishing drinking-water treatment from sewage treatment and BOD from COD.
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