This study examines the general characteristics of reactive nitrogen oxides (NOy) at urban and rural sites in terms of measurement- and modeling-based analyses. In this field study, NOx at urban and rural sites were 92 and 89% of NOy on average, respectively. HONO levels (e.g., 1.8 ppbv) at the urban site were significantly higher than those at the rural site by a factor of 4.5. HONO concentrations at the urban site during the night were clearly higher than those during the day, which were likely to result from heterogeneous reactions on the surfaces of airborne aerosols and/or grounds. In contrast, there were no significant differences of PAN concentrations in either the temporal or spatial distributions. The significantly low ratios of NOz/NOy at both sampling sites indicated a more limited chemical aging process in air mass. O3 levels were weakly related to NOx oxidation at both sites, especially at the rural site.
Bibliographical noteFunding Information:
Acknowledgments This research was financially supported by the Ministry of Environment and the Climate Environment System Research Center sponsored by the SRC program of Korea Science and Engineering Foundation.
- Modeling based analysis
- Nitrogen oxides
ASJC Scopus subject areas
- Environmental Chemistry
- Atmospheric Science