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| Variation characteristics and influencing factors of air pollution in Pearl River Delta area from 2006 to 2012 |
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Abstract Observations of Pearl River Delta (PRD) regional air quality monitoring network during 2006-2012 were employed to capture the temporal and spatial variation characteristic of air pollution over PRD and then the causes of that were analyzed. Air quality had improved generally in PRD region as result of the decrease in SO2, NO2 and PM10 concentrations by 61.7%, 17.4% and 24.3% during 2006-2012, though 12.5% increase in O3 concentration in the same period. Air quality was better in wet season (April to September) than dry season (October to March), and the monthly-averaged concentrations of various pollutions were all bimodal, with peaks in December and March for SO2, NO2 and PM10 and October and May for O3. The high concentrations for SO2, NO2 and PM10 were mainly distributed in Foshan and Guangzhou but for O3 mainly in outside suburbs of PRD. The trends of concentration for different pollutants were not consistent in different regions of PRD. The central region of PRD had more significant decrease in primary pollutants, and those decreases were induced by many factors, especially in economic downturn and environmental protection policies. However, the relatively weaker control of VOCs, as well as climatic change, could intensify the secondary pollution particular in O3.
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Received: 10 June 2014
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