title: Using High-Resolution Satellite Aerosol Optical Depth To Estimate Daily PM2.5 Geographical Distribution in Mexico City.
abstract: Recent advances in estimating fine particle (PM2.5) ambient concentrations use daily satellite measurements of aerosol optical depth (AOD) for spatially and temporally resolved exposure estimates. Mexico City is a dense megacity that differs from other previously modeled regions in several ways: it has bright land surfaces, a distinctive climatological cycle, and an elevated semi-enclosed air basin with a unique planetary boundary layer dynamic. We extend our previous satellite methodology to the Mexico City area, a region with higher PM2.5 than most U.S. and European urban areas. Using a novel 1 km resolution AOD product from the MODIS instrument, we constructed daily predictions across the greater Mexico City area for 2004-2014. We calibrated the association of AOD to PM2.5 daily using municipal ground monitors, land use, and meteorological features. Predictions used spatial and temporal smoothing to estimate AOD when satellite data were missing. Our model performed well, resulting in an out-of-sample cross-validation R(2) of 0.724. Cross-validated root-mean-squared prediction error (RMSPE) of the model was 5.55 μg/m(3). This novel model reconstructs long- and short-term spatially resolved exposure to PM2.5 for epidemiological studies in Mexico City.
authors.affiliation: †Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02215, United States.
authors.forename: Allan C
authors.initials: AC
authors.lastname: Just
authors.affiliation: ‡Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, New York, New York 10029, United States.
authors.forename: Robert O
authors.initials: RO
authors.lastname: Wright
authors.affiliation: †Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02215, United States.
authors.forename: Joel
authors.initials: J
authors.lastname: Schwartz
authors.affiliation: §Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115, United States.
authors.forename: Brent A
authors.initials: BA
authors.lastname: Coull
authors.affiliation: †Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02215, United States.
authors.forename: Andrea A
authors.initials: AA
authors.lastname: Baccarelli
authors.affiliation: ∥Center of Nutrition and Health Research, National Institute of Public Health, Cuernavaca, Morelos 62100, Mexico.
authors.forename: Martha María
authors.initials: MM
authors.lastname: Tellez-Rojo
authors.affiliation: ⊥Department of Internal Medicine-Pediatrics, University of Minnesota Medical Center, Minneapolis, Minnesota 55455, United States.
authors.forename: Emily
authors.initials: E
authors.lastname: Moody
authors.affiliation: #University of Maryland, Baltimore County, Baltimore, Maryland 21250, United States.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Wang
authors.affiliation: ∇National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC), Code 613, Greenbelt, Maryland 20771, United States.
authors.forename: Alexei
authors.initials: A
authors.lastname: Lyapustin
authors.affiliation: ¶Department of Geography and Environmental Development, Ben-Gurion University of the Negev, Beer Sheva 8410501, Israel.
authors.forename: Itai
authors.initials: I
authors.lastname: Kloog
mesh_terms: D000336:Aerosols / Q000032:analysis*; D002138:Calibration; D005843:Geography; D008800:Mexico; D008962:Models, Theoretical; D055620:Optical Phenomena; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D012044:Regression Analysis; D017215:Satellite Communications; D014481:United States
chemical_list: D000336:Aerosols; D052638:Particulate Matter