Which example is a primary air pollutant?
Correct answer: D. Sulfur dioxide emitted directly from fuel combustion
- A. Sulfuric acid aerosol formed in the atmosphere
- B. Ozone formed by reactions in sunlight
- C. Peroxyacetyl nitrate formed in photochemical smog
- D. Sulfur dioxide emitted directly from fuel combustion
Explanation
A primary pollutant is released directly from a source, and sulfur dioxide is emitted during combustion of sulfur containing fuels. Ozone, peroxyacetyl nitrate and sulfuric acid aerosol are generally secondary pollutants formed in the atmosphere.
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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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