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A primary ambient standard is set to protect

  • A.Visibility in scenic areas
  • B.Human health, including sensitive groups
  • C.Property and materials from damage
  • D.Crops and vegetation only

Answer: B

It is derived from the exposure at which health effects appear, with a margin of safety for children, older people and those with respiratory disease. Secondary standards address welfare effects such as damage to materials, crops and visibility.

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