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pe·rox·y·a·ce·tyl ni·trate(pĕ'rok-sē-ă-sē'til nī'trāt),
The major pollutant responsible for eye and nose irritation in smog.
Abbr. PAN A toxic organic compound, C2H3NO5, formed photochemically in smog, causing eye irritation and damage to vegetation. Due to the stability of this compound, it may be transported in air over long distances before breaking down into smaller reactive compounds.