Nitrous acid

From Glossary of Meteorology

nitrous acid

  1. Weak acid formed in solution by neutralization of the nitrite ion.

    Also formed when nitrogen dioxide, NO2, dissolves in water.

  2. Gaseous compound, formula HONO, that builds up in polluted, typically urban air, containing nitrogen oxides.

    The only known gas-phase reaction leading to its formation, that between hydroxyl radicals (OH) and nitric oxide (NO), is not rapid enough to account for observed levels, and the formation is thus thought to involve particles. Nitrous acid photodissociates to give OH + NO, and can thus serve as an OH source, particularly in the early morning.

Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact [email protected]. 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.