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Summer and winter variations of dicarboxylic acids, fatty acids and benzoic acid in PM<sub>2.5</sub> in Pearl Delta River Region, China

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Fig. 1. A map showing sampling sites in this study (Guangzhou (GZ), Zhaoqing (ZQ), The Hong Kong Polytechnic University (PU), Hok Tsui (HT)).
Table 1. Concentrations of dicarboxylic acids, ketocarboxylic acids, benzoic acid, and fatty acids in PM 2.5 samples in PRD during winter and summer in 2006–2007, Guangzhou (GZ), Zhaoqing (ZQ), The Hong Kong Polytechnic University (PU), Hok Tsui (HT).
Table 2. Correlation coefficients of selected dicarboxylic acids, ketocarboxylic acids and dicarbonyls at four sampling sites in PRD in winter and summer seasons.
Fig. 3. Box plots of TQWOC and sum of fatty acid concentrations (ng m −3 ) as well as TQWOC/WSOC and TQWOC/OC ratios in PM 2.5 samples during winter and summer in four cities in PRDR.

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