Study on Long-Term Correlation of CO and CO2 from Vehicle Emissions on Roadsides with the Detrended Fluctuation Analysis Method

Abstract

Detrended fluctuation analysis (DFA) is a scaling analysis method for quantifying the long-range correlation property in nonstationary time series. We have used DFA to characterize the sequence of vehicle emission during rush hours in Hong Kong. Results show a crossover phenomenon associated with a transition from the shortrange scaling exponent to a long-range one, which give evidence of carbon emissions from vehicles have a long-term correlation