Skip to content

Concurrent observations of air pollutants at two sites in the Pearl River Delta and the implication of regional transport

by H. Guo, F. Jiang, H. R. Cheng, I. J. Simpson, X. M. Wang, a. J. Ding, T. J. Wang, S. M. Saunders, T. Wang, S. H. M. Lam, D. R. Blake, Y. L. Zhang show all authors
Atmospheric Chemistry and Physics Discussions ()
Get full text at journal


An intensive field measurement study was conducted simultaneously at a site within the inland Pearl River Delta (PRD) region (WQS) and a site in Hong Kong (TC) between 22 October and 1 December 2007. Ambient air pollutants measured included O-3, NOx, CO, SO2, NMHCs, and carbonyls. The purpose is to improve our understanding of the interplay among local and regional air pollutants in the Hong Kong area, and the influence of regional transport on local air pollutants. The results indicate that the mean levels of air pollutants at the WQS site were much higher than those at the TC site, except NOx. Thirteen O-3 episode days (daily O-3 peak in excess of 122 ppbv) were monitored at WQS during the study period, while only 2 days were recorded at TC. Diurnal variations of O-3 showed higher nighttime levels of O-3 at TC than at WQS as well as more photochemical activity at WQS than TC. Remarkable differences in diurnal variations were also found between high and low O-3 pollution days at each site, implying that Hong Kong is more acutely VOC-limited than the inland PRD region. Ratio analyses for trace gases and VOCs and back trajectory calculation revealed that the air masses arriving at WQS were more aged due to regional influence, whereas the air masses at TC were mainly affected by local emissions and/or regional transport. In addition, the influence of regional transport from Eastern China on the primary pollutants of Hong Kong was noticeable, whereas the air masses from the inland PRD region (e. g. Dongguan and Huizhou) had significant influence on the air pollutants at WQS, and the anthropogenic emissions in Eastern PRD (e. g. Shenzhen) played an important role on the photochemical ozone pollution in Western Hong Kong. These results confirm that regional and sub-regional transport of air pollution has a complex and significant impact on local air pollutants in this region.

Cite this document (BETA)

Authors on Mendeley

Readership Statistics

21 Readers on Mendeley
by Discipline
62% Environmental Science
14% Physics and Astronomy
14% Earth and Planetary Sciences
by Academic Status
48% Researcher
19% Student > Master
10% Professor > Associate Professor
by Country
5% Belgium
5% Hong Kong

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Sign up & Download

Already have an account? Sign in