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Estimating PM2.5 Concentrations in Xi'an City Using a Generalized Additive Model with Multi-Source Monitoring Data

Fig 5

Spatial distribution of annual mean AOT in 2013 for Xi'an and its surrounding cities.

Fig 5

doi: https://doi.org/10.1371/journal.pone.0142149.g005