College of Resources and Environment, Southwest University, Chongqing, 400715, China.
College of Geography and Tourism, Chongqing Normal University, Chongqing, 401331, China.
J Environ Manage. 2023 Jan 1;325(Pt A):116503. doi: 10.1016/j.jenvman.2022.116503. Epub 2022 Oct 20.
Studying the spatiotemporal characteristics of air pollutants in urban agglomerations and their response factors will help to improve the quality of urban living. In combining air quality monitoring data and wavelet analysis from the Chengdu-Chongqing urban agglomeration (CCUA), this study assessed the spatiotemporal distribution characteristics and influential factors of air pollutants on daily, monthly and annual scales. The results showed that the concentration of air pollutants in the CCUA has decreased year by year, and air quality has improved. Except for O, pollutants in autumn and winter were higher than those in summer. The spatial distribution of air pollutants was obvious distributed in Chengdu, Chongqing, Zigong and Dazhou. Pollution incidents were mainly concentrated in winter. The 6 air pollutants and air quality index (AQI) have dominant periods on multiple time scales. AQI showed positive coherence with PM and PM on multiple time scales, and obvious positive coherence with SO, CO, NO and O in the short term scale. AQI was not strongly correlated with the fire point, but exhibited obvious negative coherence in the long term scale. In addition, AQI showed an obvious positive correlation with temperature and sunshine hours in short term, and a clear negative correlation with humidity and rainfall. The research results of this paper will provide a reference for pollution prevention and control in the CCUA.
研究城市群中空气污染物的时空特征及其响应因素有助于提高城市生活质量。本研究结合成都-重庆城市群（CCUA）的空气质量监测数据和小波分析，评估了空气污染物在日、月和年尺度上的时空分布特征及其影响因素。结果表明，CCUA 中空气污染物的浓度逐年下降，空气质量有所改善。除 O 外，秋冬季污染物浓度高于夏季。空气污染物的空间分布明显分布在成都、重庆、自贡和达州。污染事件主要集中在冬季。六种空气污染物和空气质量指数（AQI）在多个时间尺度上具有主导周期。AQI 在多个时间尺度上与 PM 和 PM 呈正相关，与 SO、CO、NO 和 O 在短期尺度上呈明显正相关。AQI 与火点数的相关性不强，但在长期尺度上呈明显负相关。此外，AQI 在短期与温度和日照小时数呈明显正相关，与湿度和降雨量呈明显负相关。本文的研究结果将为 CCUA 的污染防治提供参考。
