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Posterior averages of PM2.5 concentrations across 2003–2005 in the 20-county metropolitan Atlanta, GA area based on (top left) the PM2.5-AOD Bayesian hierarchical model (BHM), (top right) the PM2.5-CMAQ BHM, (bottom left) the ensemble method for days in the three-year time period where AOD is observed, and (bottom right) the ensemble method for all days in the three-year time period.
