title: Spatial and temporal analysis of Air Pollution Index and its timescale-dependent relationship with meteorological factors in Guangzhou, China, 2001-2011.
abstract: There is an increasing interest in spatial and temporal variation of air pollution and its association with weather conditions. We presented the spatial and temporal variation of Air Pollution Index (API) and examined the associations between API and meteorological factors during 2001-2011 in Guangzhou, China. A Seasonal-Trend Decomposition Procedure Based on Loess (STL) was used to decompose API. Wavelet analyses were performed to examine the relationships between API and several meteorological factors. Air quality has improved since 2005. APIs were highly correlated among five monitoring stations, and there were substantial temporal variations. Timescale-dependent relationships were found between API and a variety of meteorological factors. Temperature, relative humidity, precipitation and wind speed were negatively correlated with API, while diurnal temperature range and atmospheric pressure were positively correlated with API in the annual cycle. Our findings should be taken into account when determining air quality forecasts and pollution control measures.
authors.affiliation: Department of Biostatistics, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong 510515, China.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Mathematics and Physics, School of Biomedical Engineering, Southern Medical University, Guangzhou, Guangdong 510515, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Qian
authors.affiliation: Department of Biostatistics, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong 510515, China. Electronic address: ocq@smu.edu.cn.
authors.forename: Chun-Quan
authors.initials: CQ
authors.lastname: Ou
authors.affiliation: Department of Biostatistics, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong 510515, China.
authors.forename: Ying-Xue
authors.initials: YX
authors.lastname: Zhou
authors.affiliation: Department of Biostatistics, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong 510515, China.
authors.forename: Cui
authors.initials: C
authors.lastname: Guo
authors.affiliation: Department of Epidemiology and Biostatistics, School of Population Health, The University of Queensland, Brisbane, Queensland 4006, Australia.
authors.forename: Yuming
authors.initials: Y
authors.lastname: Guo
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data*; D002681:China; D002980:Climate; D004784:Environmental Monitoring / Q000379:methods*; D008685:Meteorological Concepts; D012621:Seasons; D062211:Spatio-Temporal Analysis; D013696:Temperature; D014887:Weather; D014919:Wind
chemical_list: D000393:Air Pollutants
keywords: Air pollution; Meteorological factors; Seasonal-Trend Decomposition Procedure Based on Loess; Timescale-dependent relationship; Wavelet analysis