Quantifying population exposure to air pollution using individual mobility patterns inferred from mobile phone data

• Published in: Journal of exposure science & environmental epidemiology Vol. 29; no. 2; pp. 238 - 247
• Main Authors: Nyhan, M. M., Kloog, I., Britter, R., Ratti, C., Koutrakis, P.
• Format: Journal Article
• Language: English
• Published: New York Nature Publishing Group US 01.03.2019; Nature Publishing Group
• Subjects: Aerosols; Air Pollutants - analysis; Air pollution; Air Pollution - analysis; Cell Phone; Cell phones; Cellular communication; Cellular telephones; Environmental Exposure - analysis; Environmental Monitoring - methods; Epidemiology; Exposure; Female; Human populations; Humans; Land pollution; Land use; Male; Medicine; Medicine & Public Health; Mobile communication systems; Mobility; Optical analysis; Particulate matter; Particulate Matter - analysis; Populations; Prospective Studies; Regression models; Population exposure; Mobility; Cellular network data; Air pollution; PM; PM2.5
• ISSN: 1559-0631; 1559-064X; 1559-064X
• DOI: 10.1038/s41370-018-0038-9

A critical question in environmental epidemiology is whether air pollution exposures of large populations can be refined using individual mobile-device-based mobility patterns. Cellular network data has become an essential tool for understanding the movements of human populations. As such, through inferring the daily home and work locations of 407,435 mobile phone users whose positions are determined, we assess exposure to PM 2.5 . Spatiotemporal PM 2.5 concentrations are predicted using an Aerosol Optical Depth- and Land Use Regression-combined model. Air pollution exposures of subjects are assigned considering modeled PM 2.5 levels at both their home and work locations. These exposures are then compared to residence-only exposure metric, which does not consider daily mobility. In our study, we demonstrate that individual air pollution exposures can be quantified using mobile device data, for populations of unprecedented size. In examining mean annual PM 2.5 exposures determined, bias for the residence-based exposures was 0.91, relative to the exposure metric considering the work location. Thus, we find that ignoring daily mobility potentially contributes to misclassification in health effect estimates. Our framework for understanding population exposure to environmental pollution could play a key role in prospective environmental epidemiological studies.