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BDifficulty 2/5

Why can reducing traffic emissions be especially important in densely populated urban areas?

Correct answer

Because it can affect many people exposed to traffic.

Because many people may be exposed near busy streets. Pollution also depends on vehicle type, other sources and air dispersion. Not all pollution comes from cars, nor is it always higher in every city than in every rural area.

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All options

  • Because pollution never exists outside cities.

  • Because every urban pollutant comes exclusively from cars.

  • Because it can affect many people exposed to traffic.

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