London Hybrid Exposure Model: Improving Human Exposure Estimates to NO2 and PM2.5 in an Urban Setting

• DOI: 10.1021/acs.est.6b01817
• Publication Date: 2016-10-06T11:24:56Z
• Authors: James David Smith; Christina Mitsakou; Nutthida Kitwiroon; Ben M. Barratt; Heather A. Walton; Jonathon G. Taylor; Hugh Ross Anderson; Frank J. Kelly; Sean D. Beevers
• Keywords: Exposure Assessment; Multiple exposure

Here we describe the development of London Hybrid Exposure Model (LHEM), which calculates exposure Greater population to outdoor air pollution sources, in-buildings, in-vehicles, and outdoors, using survey data when where people spend their time. For comparison estimate misclassification compared Londoners LHEM with at residential address, a commonly used metric in epidemiological research. In 2011, mean annual sources was estimated be 37% lower for PM2.5 63% NO2 than address. These decreased estimates reflect effects reduced indoors, amount time spent indoors (∼95%), mode duration travel London. We find that an individual's outside address is highly correlated (Pearson's R 0.9). contrast, suggest degree correlation influenced by different transport modes. Further has potential increase understanding error bias time-series cohort studies thus better distinguish independent PM2.5.