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. Author manuscript; available in PMC: 2022 Feb 1.

Published in final edited form as: J Air Waste Manag Assoc. 2021 Feb;71(2):209–230. doi: 10.1080/10962247.2020.1826366

Figure 9.B. — Predicted surfaces of traffic-related sources from GAM models on standardized scale, excluding Long Beach from the analysis. Contour lines delineate areas (locations) of statistically significant higher (red) or lower (blue) concentrations. Vertical lines in color scale indicate median values.

Figure 9.B. — Predicted surfaces of traffic-related sources from GAM models on standardized scale, excluding Long Beach from the analysis. Contour lines delineate areas (locations) of statistically significant higher (red) or lower (blue) concentrations. Vertical lines in color scale indicate median values.