Europe-wide air pollution modeling from 2000 to 2019 using geographically weighted regression. (October 2022)

• Record Type: Journal Article
• Authors: Shen, Youchen; de Hoogh, Kees; Schmitz, Oliver; Clinton, Nicholas; Tuxen-Bettman, Karin; Brandt, Jørgen; Christensen, Jesper H.; Frohn, Lise M.; Geels, Camilla; Karssenberg, Derek; Vermeulen, Roel; Hoek, Gerard
• Is Part Of: Environment international. Volume 168(2022)
• Publication Date: 2022-10
• Subjects: Spatially varying coefficient -- Spatiotemporal variation -- Geographically and temporally weighted regression -- Random forest -- Land-use regression; Environmental protection -- Periodicals; Environmental health -- Periodicals; Environmental monitoring -- Periodicals; Environmental Monitoring -- Periodicals; Environnement -- Protection -- Périodiques; Hygiène du milieu -- Périodiques; Environnement -- Surveillance -- Périodiques; Environmental health; Environmental monitoring; Environmental protection; Periodicals; 333.705
• DOI: 10.1016/j.envint.2022.107485
• Languages: English
• ISSNs: 0160-4120

Abstract

Highlights: We included spatially-varying relationships in our Europe-wide models. We built spatially- and temporally-varying models to estimate annual air pollution. Spatially-varying linear regression was more robust than a machine learning method. Abstract: Previous European land-use regression (LUR) models assumed fixed linear relationships between air pollution concentrations and predictors such as traffic and land use. We evaluated whether including spatially-varying relationships could improve European LUR models by using geographically weighted regression (GWR) and random forest (RF). We built separate LUR models for each year from 2000 to 2019 for NO2, O3, PM2.5 and PM10 using annual average monitoring observations across Europe. Potential predictors included satellite retrievals, chemical transport model estimates and land-use variables. Supervised linear regression (SLR) was used to select predictors, and then GWR estimated the potentially spatially-varying coefficients. We developed multi-year models using geographically and temporally weighted regression (GTWR). Five-fold cross-validation per year showed that GWR and GTWR explained similar spatial variations in annual average concentrations (average R 2 = NO2 : 0.66; O3 : 0.58; PM10 : 0.62; PM2.5 : 0.77), which are better than SLR (average R 2 = NO2 : 0.61; O3 : 0.46; PM10 : 0.51; PM2.5 : 0.75) and RF (average R 2 = NO2 : 0.64; O3 : 0.53; PM10 : 0.56; PM2.5 : 0.67). The GTWR predictions and a previously-used method of back-extrapolating 2010 model predictions using CTM were overall highly correlated (R 2 > 0.8) for all pollutants. Including spatially-varying relationships using GWR modestly improved European air pollution annual LUR models, allowing time-varying exposure-health risk models.