摘要：Based on the dynamics of air pollution in the Lanzhou from July 1, 2000 to June 30, 2015, the multi-scale characteristics of air pollution indices (i.e. SO2, NO2 and PM10) are analyzed using the detrended cross-correlation analysis (DCCA). In the double logarithm curve logF2(^-log'thelong-range correlation of PM10 vs. NO2 shows only one scaling regimes at the whole timescale which means their cross-correlation keep exhibiting long-term persistence with positive power-law in the scale-free interval of greater than 16 years; the long-range correlation of SO2 vs. NO2 shows two scaling regimes with two different scale indexes and a critical time scale of about one year; the long-range correlation of SO2 vs. PM10 presents three scaling regime with three different scale indexes and with two critical time scales of about one year and 10 years. These results reject the multi-scale response characteristics of the air pollution indices change on different time scales.
