Environmental Science & Technology (27) Mudway, I. S.; Stenfors, N.; Duggan, S. T.; Roxborough, H.; Zielinski, H.; Marklund, S. L.; Blomberg, A.; Frew, A. J.; Sandstromb, T.; Kelly, F. J. An in vitro and in vivo investigation of the effects of diesel exhaust on human airway lining fluid antioxidants. Arch. Biochem. Biophys. 2004, 423 (1), 200−212. (28) Ordnance Survey MasterMap; http://www.ordnancesurvey.co. uk/oswebsite/products/os-mastermap/topography-layer/index.html (accessed September 13, 2010). (29) London Atmospheric Emissions Inventory 2003, 2nd Annual Report; Greater London Authority: London, UK, 2006; http://static.london. gov.uk/mayor/environment/air_quality/docs/laei_2003.pdf. (30) Kelly, F. J.; Anderson, H. R.; Armstrong, B.; Atkinson, R.; Barratt, B.; Beevers, S.; Cook, D.; Derwent, R.; Duggan, S.; Green, D.; Mudway, I. S.; Wilkinson, P. The impact of the congestion charging scheme on air quality in London: Part 2. Analysis of the oxidative potential of particulate matterRes. Rep. - Health Eﬀ. Inst. 2011, 155, 73−144. (31) Tonne, C.; Beevers, S.; Armstrong, B. G.; Kelly, F.; Wilkinson, P. Air pollution and mortality benefits of the London Congestion Charge: Spatial and socioeconomic inequalities. Occup. Environ. Med. 2008, 65 (9), 620−627. (32) Wood, S. N. Stable and efficient multiple smoothing parameter estimation for generalized additive models. J. Am. Stat. Assoc. 2004, 99 (467), 673−686. (33) Wood, S. N. Fast stable direct fitting and smoothness selection for generalized additive models. J. R. Stat. Soc. (B) 2008, 70 (3), 495−518. (34) Wood, S. N. Generalized Additive Models: An Introduction with R; Chapman and Hall/CRC: Boca Raton, Florida, U.S.A., 2006. (35) R Development Core Team. R: A Language and Environment for Statistical Computing; R Foundation for Statistical Computing: Vienna, Austria, 2009; ISBN 3-900051-07-0, http://www.R-project.org. (36) Jerrett, M.; Arain, A.; Kanaroglou, P.; Beckerman, B.; Potoglou, D.; Sahsuvaroglu, T.; Morrison, J.; Giovis, C. A review and evaluation of intraurban air pollution exposure models. J. Exposure Anal. Environ. Epidemiol. 2005, 15 (2), 185−204. (37) Hoek, G.; Beelen, R.; de Hoogh, K.; Vienneau, D.; Gulliver, J.; Fischer, P.; Briggs, D. A review of land-use regression models to assess spatial variation of outdoor air pollution. Atmos. Environ. 2008, 42 (13), 7561−7578. Article 7620 dx.doi.org/10.1021/es3010305 | Environ. Sci. Technol. 2012, 46, 7612−7620