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. Author manuscript; available in PMC: 2021 Feb 1.
Published in final edited form as: Atmos Environ (1994). 2019 Nov 14;222:117130. doi: 10.1016/j.atmosenv.2019.117130

Figure 2. Daily cross-validation RMSE over year 2011 stratified by season.

Figure 2.

Daily root mean squared error (“RMSE”) for PM2.5 concentration predictions in μg/m3 stratified by season. Results are displayed for four representative methods: Inverse Distance Weighting (“IDW”), Universal Kriging with CMAQ as only predictor (“UK”), the Downscaler model (“Down”) and Random Forest (“RF”). In each panel, the lines are loess smoothers.