Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Nov. 7, 2023

Regional air pollution is a multifaceted and dynamic system, rendering linear statistical approaches insufficient in capturing its inherent patterns of variability, particularly the intricate spatiotemporal fluctuations multiple indicators. Therefore, this study examines synergistic evolution impact mechanisms PM_2.5 O₃ four cities China’s Yangtze River Delta base from 2013 to 2022 by complex systems theory. Initially, multifractality long-term persistence between are confirmed each city using Multifractal Detrended Cross-Correlation Analysis (MFDCCA). Subsequently, evaluation indicators established assess control effects. Furthermore, factors influencing coordinated analyzed Ensemble Empirical Mode Decomposition (EEMD). Finally, Self-Organized Criticality (SOC) theory introduced understand concentration patterns. The results indicate: (1) Multifractality exist cities, strengthens with implementation atmospheric prevention policies. application facilitates explanation quantification effectiveness O₃. (2) Since 2013, except for Nanjing, effects Shanghai, Hangzhou, Suzhou have been unsatisfactory not effectively improved. (3) Compared human activities, measures, periodic meteorological variations, long-range transport regional pollutants greater influence on regulation (4) SOC may be primary mechanism O₃, sudden events such as epidemic measures can disrupt existing balance thereby reducing

Language: Английский