Formaldehyde and acetaldehyde at different elevations in mountainous areas in Hong Kong

Zhenhao Ling, Hai Guo, Gexiang Chen, Sean Ho Min Lam, Shaojia Fan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)

Abstract

Intensive field measurements of formaldehyde (HCHO) and acetaldehyde (CH3CHO) were concurrently conducted at a mountain site (TMS) and an urban site (TW) at the foot of the same mountain in Hong Kong from September to November 2010. The spatiotemporal variations of HCHO and CH3CHO, the correlation between HCHO and CH3CHO and the ratios of HCHO/CH3CHO indicated different impacts of primary emissions and secondary formation at the two sites. The source apportionments of HCHO and CH3CHO at both sites were investigated using the Positive Matrix Factorization (PMF) model, while the in-situ formation of HCHO and CH3CHO was estimated using a Photochemical Box Model coupled with Master Chemical Mechanism (PBM-MCM). At TMS, the in-situ formation was the most significant contributor to ambient HCHO and CH3CHO, accounting for 51 ± 5 and 32 ± 2%, respectively, followed by the transport of photochemicallyformed aldehydes, vehicular emissions, biogenic emissions, biomass burning and solvent usage. On the other hand, at TW, the in-situ formation and vehicular emissions explained 55 ± 7% and 18 ± 1% of ambient HCHO, respectively, while vehicular emissions and in-situ formation made comparable contributions to CH3CHO (~35%). The findings are helpful for the formulation and implementation of appropriate control strategies for aldehydes and their precursors in Hong Kong.
Original languageEnglish
Pages (from-to)1868-1878
Number of pages11
JournalAerosol and Air Quality Research
Volume16
Issue number8
DOIs
Publication statusPublished - 1 Aug 2016

Keywords

  • CH CHO 3
  • HCHO
  • Hong Kong
  • Source apportionment

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution

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