Coefficients of the regression model for visual range (VR) and air pollution index (API) during Period-1 (1973–1982), Period-2 (1983–1995), Period-3 (1996–2005), and Period-4 (2006–2010) in Chengdu.
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aStandard deviation. bSample number of the monthly average values of each VR and API. cCorrelation coefficient. dAnnual rate of change: R = 12β (km yr−1 for VR for API yr−1). ePeriod-3 for the API was from 2000–2005.
创建时间：
2013-07-18
