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Which consequence does that persistence have?

  • A.Intercontinental transport of pollution
  • B.Rapid local deposition, which confines the effects of any emission to the immediate vicinity of its source
  • C.No consequence
  • D.Removal within a few hours, which means that concentrations respond immediately to any change in emissions

Answer: A

A lifetime of a week allows accumulation mode aerosol to cross an ocean, so Asian dust and pollution reach North America and Saharan dust reaches the Caribbean and Amazonia. The Saharan dust deposition is a significant nutrient source for the Amazon. Recognising that air pollution is a hemispheric as well as a local problem follows directly from the removal timescale.

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