Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/29805
Title: Nitrous acid (HONO) in a polluted subtropical atmosphere : seasonal variability, direct vehicle emissions and heterogeneous production at ground surface
Authors: Xu, Z
Wang, T 
Wu, J
Xue, L
Chan, J
Zha, Q
Zhou, S
Louie, PKK
Luk, CWY
Keywords: Black carbon
Heterogeneous reaction
Nitrous acid
Seasonal variation
Vehicle emission
Issue Date: 2015
Publisher: Pergamon Press
Source: Atmospheric environment, 2015, v. 106, p. 100-109 How to cite?
Journal: Atmospheric environment 
Abstract: Although nitrous acid (HONO) plays an important role in the chemistry of polluted atmospheres, its atmospheric abundances and sources are still not well understood. This paper reports ambient measurements of HONO taken over four select months in different seasons at a suburban site in Hong Kong. The data were analyzed to elucidate the seasonal characteristics, emission ratios and rates of heterogeneous production. The monthly averaged HONO concentrations ranged from 0.35¡Ó0.30ppbv in late spring (May) to 0.93¡Ó0.67ppbv in late autumn (November). The similar variation patterns of HONO, NOx, and traffic flow from midnight to rush hours suggest that the HONO concentration was strongly influenced by vehicle emissions. The emission ratios (HONO/NOx) were derived from an analysis of 21 fresh plumes (NO/NOx0.80), with the range of 0.5-1.6%. The large variability in the emission ratios is attributed to the reaction of NO2 on black carbon (BC) emitted from vehicles, based on
URI: http://hdl.handle.net/10397/29805
ISSN: 1352-2310
EISSN: 1873-2844
DOI: 10.1016/j.atmosenv.2015.01.061
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