Peroxyacetyl nitrate

From Glossary of Meteorology

peroxyacetyl nitrate

(Abbreviated PAN; also called peroxyacetic nitric anhydride.) Organic compound formed in the atmosphere from the addition of nitrogen dioxide, NO2, to the peroxyacyl radical formed in the oxidation of acetaldehyde.

PAN and its larger homologs are irritants to the eyes and breathing system. They are formed in dangerous levels in photochemical smogs. The PANs are thermally quite stable "reservoir" species and can transport active nitrogen from polluted to pristine regions.

Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.