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. Author manuscript; available in PMC: 2021 Mar 1.
Published in final edited form as: Atmos Environ (1994). 2020 Jan 27;224:117309. doi: 10.1016/j.atmosenv.2020.117309

Fig. 2. Observed PM2.5 concentrations and modeled ratios.

Fig. 2.

(A) Monthly median concentrations (solid black squares) and interquartile ranges (vertical lines) of PM2.5 over monitoring stations in the National Capital Region across 2010–2016. (B) Variability (standard deviations) in PM2.5 concentrations within (black squares) and between (dark red triangles) stations over months across 2010–2016. (C) Monthly median estimated ratio (solid black squares) and interquartile ranges (vertical lines) of PM2.5: PM10 over monitoring stations across 2010–2016 obtained from the calibration using a support vector regression.