Source apportionment of volatile organic compounds by Positive Matrix Factorization in Hong Kong

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Source apportionment of volatile organic compounds by Positive Matrix Factorization in Hong Kong

 

Author: Wong, Lok-cheung
Title: Source apportionment of volatile organic compounds by Positive Matrix Factorization in Hong Kong
Degree: M.Sc.
Year: 2012
Subject: Volatile organic compounds -- China -- Hong Kong.
Volatile organic compounds -- Analysis.
Air quality -- China -- Hong Kong.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Structural Engineering
Pages: vii, 90 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2512021
URI: http://theses.lib.polyu.edu.hk/handle/200/6534
Abstract: The air quality of Hong Kong has been deteriorating for the past few decades. The Positive Matrix Factorization (PMF) receptor model have been used to analyse the real-time volatile organic compounds (VOCs) data collected at the western of Hong Kong from 2005 to 2010. The purposes are to identify the major sources responsible for VOCs emissions and to investigate the contributions of these sources. Fourteen VOC sources were frequently identified over the six years, which solvent usage, vehicular emissions, and mixture of gasoline and LPG usage were the first three largest VOCs contributors in Hong Kong. The results indicated that solvent usage, vehicular emissions, and mixed source of gasoline evaporation and LPG usage were contributed 39%, 29% and 19% of the total VOCs emissions over the six years, respectively. Moreover, the annual trend showed that the emissions from solvent usage had a slightly increase while vehicular emissions had a slightly decrease in VOCs emissions over the six years. In addition, the monthly trends showed that concentrations of VOCs emissions were generally higher in cold season than in warm season. The findings advance our knowledge of the formation of photochemical ozone in both Hong Kong and the Pearl River Delta (PRD) regions.

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