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1. Oxford Dictionary

   air pollution

   • n.
     the presence in or introduction into the air of a substance which has harmful or poisonous effects

   • noun: air pollution

2. • 釋義

   n.

   名詞

   • 1. the presence in or introduction into the air of a substance which has harmful or poisonous effects diesel exhaust and other forms of air pollution
3. • 更多解釋

   air pollution

   • n.
     the presence in or introduction into the air of a substance which has harmful or poisonous effects: diesel exhaust and other forms of air pollution

   Oxford American Dictionary