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Istituto sull'inquinamento atmosferico

Torna all'elenco Contributi in rivista anno 2014

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Sources of atmospheric nitrous acid: State of the science, current research needs, and future prospects

Anno di pubblicazione: 2014

Formato: Elettronico

Autori: Spataro, Francesca; Ianniello, Antonietta

Affiliazioni autori: CNR Inst Atmospher Pollut Res

Autori CNR:


Lingua: inglese

Abstract: Nitrous acid (HONO) plays a key role in tropospheric photochemistry, primarily due to its role as a source of hydroxyl (OH) radicals via its rapid photolysis. OH radicals are involved in photooxidation processes, such as the formation of tropospheric O-3 and other secondary atmospheric pollutants (peroxyacetyl nitrate [PAN] and secondary particles). Recent field and modeling studies have postulated the occurrence of a strong and unknown daytime HONO source, but there are still many significant uncertainties concerning the identification and formation mechanisms of these unknown sources. Up to now, five HONO formation pathways are known: direct emission, homogeneous gas-phase reactions, heterogeneous reactions, surface photolysis, and biological processes. In this review paper, the HONO sources proposed to explain the observed HONO budget, especially during daytime, are discussed, highlighting the knowledge gaps that need further investigation. In this framework, it is crucial to have available accurate and reliable measurements of atmospheric HONO concentrations; thus, a short description of HONO measurement techniques currently available is also reported. The techniques are divided into three basic categories: spectroscopic techniques, wet chemical techniques, and off-line methods.

Lingua abstract: inglese

Pagine da: 1232

Pagine a: 1250

Pagine totali: 19


Journal of the Air & Waste Management Association Air and Waste Management Association,
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 1096-2247

Numero volume: 64

Numero fascicolo: 11

DOI: 10.1080/10962247.2014.952846

Referee: Sė: Internazionale

Stato della pubblicazione: Published version

Indicizzato da: ISI Web of Science (WOS) [000343313500004]

Parole chiave:

  • nitrous acid
  • formation pathways
  • techniques

URL: http://dx.doi.org/10.1080/10962247.2014.952846

Data di accettazione: 25/08/2014

Strutture CNR:


Allegati: Sources of atmospheric nitrous acid: State of the science, current research needs, and future prospects (application/pdf)
As important OH radical precursor, HONO plays a key role in the atmosphere. OH radicals are involved in photo-oxidation processes, resulting in the formation of tropospheric O3 and secondary pollutants (PAN and secondary particles). The identification of species affecting the oxidation capacity of the atmosphere is crucial for the understanding of the tropospheric chemistry and in determining effective pollution control strategies. Current models underestimate HONO, especially during daytime, since sources are lacking. Although significant uncertainties still exist, some additional sources contributing to HONO budget have been discussed. Advantages and limitations of the currently HONO measurement techniques are also reported.

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