peroxyacetyl nitrate

per·oxy·ace·tyl nitrate

noun
\pə-ˌräk-sē-ə-ˈsēt-^əl-, -ˈas-ət-; -ˈas-ə-ˌtēl-\

Definition of PEROXYACETYL NITRATE

: a toxic compound C₂H₃O₅N irritating to the eyes and upper respiratory tract that is formed by the action of sunlight on volatile organic compounds and oxides of nitrogen and is found especially in smog—abbreviation PAN