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- W2356734471 abstract "Based on the observations at Lin'an regional background station in Zhejiang Province from December 2003 to November 2004,the seasonal and diurnal variations of NOx and SO2 concentrations are analyzed.Result shows that the winter background concentrations of acidic gases NOx and SO2in the Yangtze River Delta region are the highest with 23.81×10-9and 37.3×10-9(volume fraction),respectively,mainly affected by the relatively high concentration contamination transportation from the urban agglomeration of Shanghai-Nanjing area to the northeast of Lin'an.The concentrations of acidic gases are the lowest in summer,mainly contributed by the local emission sources.Rainfall can obviously scavenge SO2,but it has low effect on NOx.The diurnal variation of NOx concentration presents a typical bimodal pattern with the higher value at 09:00 BST and the maximum at 18:00 BST in winter,while the variation is an unimodal pattern with the maximum at 07:00 BST in summer.The diurnal variation of SO2 concentration is remarkable in winter and spring with the maximum around 06:00 BST and the minimum around 15:00 BST.The air quality of annual regional NO2 conforms to the primary standard of GB 30952—1996(Ambient Air Quality Standard),but SO2 concentration exceeds the allowable limit notably in winter and spring for the obvious influence of human activity.Air pollution indexes of NO2 and SO2 reach the maximums 50 and 93 in December,respectively.The weekend effect of NO2 and SO2 does not happen in this region." @default.
- W2356734471 created "2016-06-24" @default.
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- W2356734471 date "2008-01-01" @default.
- W2356734471 modified "2023-09-25" @default.
- W2356734471 title "Features of Acidic Gases in Background Air of Yangtze River Delta" @default.
- W2356734471 hasPublicationYear "2008" @default.
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