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Spatio-Temporal Variations of Urban NO2 Concentrations in China
The spatial and temporal characteristics of NO2 concentration were analysed from 31 cities in China over a six-year period (2003-2008). Urban NO2 concentrations were in the range of 12-73μg/m3, and its pollution levels had an expanding trend in the temporal variations during 2003-2008. Spatially, there was an evident difference for urban NO2 concentration in the three regions of the eastern, central and western China. NO2 concentrations in cities had a significant reduction in eastern China, an obviously heightened trend in central China and a small heightened trend in western China due to the combined effects of industrial structural transformation and industrial upgrading, as well as control measures.
Keywords
Urban NO2 Concentration, Spatial Variation, Temporal Variation, China.
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