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1. Oxford American Dictionary

   air quality

   • IPA[er ˈkwälədē]

   美式

   • n.
     the degree to which the ambient air is pollution-free, assessed by measuring a number of indicators of pollution.

   • noun: air quality, plural noun: air qualities

2. • 更多解釋

   air quality

   英式

   • n.
     the degree to which the air in a particular place is pollution-free.

   Oxford Dictionary