Abstract
© 2018 Elsevier Ltd Compared to the space-borne estimation of PM 2.5 (particulate matter with aerodynamic diameter ≤2.5 μm), the investigation of PM 1 (≤1 μm) remains less intensive and thus unclear. Here we estimated four years (2014–2017) of ground-level PM 1 concentrations from MODIS aerosol optical depth (AOD) in
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