# Size-Segregated Particulate Mass and Carbonaceous Components in Roadside and Riverside Environments
## 3 Results and Discussion
### Contribution of Local Emission Sources
#### 3.2.2 Behavior of Carbonaceous Components in Size-Fractionated Particles
The concentration of OC and OC/EC for the 0.5-1 and 1-2.5 \(\upmu\)m fractions increased in the nocturnal period, where the OC/EC ratio was larger at the RV site, while EC and soot-EC were smaller, especially in the case of the \(>\)2.5 \(\upmu\)m range. Such tendencies in the OC and related parameters may be explained by a larger amount of local biomass burning near the RV site. The larger average char-EC/soot-EC ratio for the 1-2.5 \(\upmu\)m range at the RV site may also explain this. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Sampling**} & **OC** & **EC** & **TC** & **OC/EC** & **Char-EC** & **Soot-EC** & **Soot-EC** & **Char/Soot-** & **TC/PM** \\
**Site** & **(\(\upmu\)g/m\({}^{3}\))** & **(\(\upmu\)g/m\({}^{3}\))** & **(\(\upmu\)g/m\({}^{3}\))** & **(\(\upmu\)g/m\({}^{3}\))** & **(\(\upmu\)g/m\({}^{3}\))** & **(\(\upmu\)g/m\({}^{3}\))** & **(-)** & **(-)** & **(-)** \\ \hline \multicolumn{10}{c}{2.5–10 \(\upmu\)m} \\ \multicolumn{10}{c}{Diurnal (D) and nocturnal (N)} \\ \hline RSD & 2.75 & 1.58 & 4.33 & 1.81 & 1.01 & 0.57 & 0.02 & 1.79 & 0.17 \\  & \(\pm\)0.73 & \(\pm\)0.32 & \(\pm\)0.73 & \(\pm\)0.63 & \(\pm\)0.31 & \(\pm\)0.07 & \(\pm\)0.00 & \(\pm\)0.57 & \(\pm\)0.03 \\  & 9.69 & 3.95 & 13.6 & 2.80 & 2.13 & 1.82 & 0.02 & 1.33 & 0.35 \\  & \(\pm\)11.4 & \(\pm\)4.47 & \(\pm\)15.8 & \(\pm\)1.57 & \(\pm\)2.48 & \(\pm\)2.11 & \(\pm\)0.02 & \(\pm\)0.84 & \(\pm\)0.41 \\  & 1.72 & 0.65 & 2.37 & 2.64 & 0.48 & 0.17 & 0.01 & 3.21 & 0.17 \\  & \(\pm\)0.57 & \(\pm\)0.17 & \(\pm\)0.73 & \(\pm\)0.40 & \(\pm\)0.12 & \(\pm\)0.06 & \(\pm\)0.00 & \(\pm\)1.08 & \(\pm\)0.05 \\  & 3.39 & 0.82 & 4.21 & 5.23 & 0.58 & 0.24 & 0.01 & 2.74 & 0.20 \\  & \(\pm\)1.37 & \(\pm\)0.29 & \(\pm\)1.14 & \(\pm\)4.54 & \(\pm\)0.33 & \(\pm\)0.06 & \(\pm\)0.01 & \(\pm\)2.01 & \(\pm\)0.10 \\ \hline \multicolumn{10}{c}{Daily} \\ \hline RS & 6.22 & 2.76 & 8.98 & 2.31 & 1.57 & 1.20 & 0.02 & 1.56 & 0.26 \\  & \(\pm\)6.08 & \(\pm\)2.39 & \(\pm\)8.25 & \(\pm\)1.10 & \(\pm\)1.40 & \(\pm\)1.09 & \(\pm\)0.01 & \(\pm\)0.70 & \(\pm\)0.22 \\  & 2.55 & 0.73 & 3.29 & 3.94 & 0.53 & 0.20 & 0.01 & 2.98 & 0.18 \\  & \(\pm\)0.97 & \(\pm\)0.23 & \(\pm\)0.94 & \(\pm\)2.47 & \(\pm\)0.22 & \(\pm\)0.06 & \(\pm\)0.00 & \(\pm\)1.54 & \(\pm\)0.07 \\ \hline \multicolumn{10}{c}{\(>\)10 \(\upmu\)m} \\ \hline \multicolumn{10}{c}{Diurnal (D) and nocturnal (N)} \\ \hline RSD & 1.54 & 0.84 & 2.38 & 1.77 & 0.43 & 0.42 & 0.03 & 1.35 & 0.15 \\  & \(\pm\)1.93 & \(\pm\)0.99 & \(\pm\)2.91 & \(\pm\)0.24 & \(\pm\)0.40 & \(\pm\)0.59 & \(\pm\)0.04 & \(\pm\)0.39 & \(\pm\)0.17 \\  & 1.34 & 0.79 & 2.13 & 1.95 & 0.42 & 0.37 & 0.02 & 1.10 & 0.09 \\  & \(\pm\)0.69 & \(\pm\)0.47 & \(\pm\)1.14 & \(\pm\)1.02 & \(\pm\)0.28 & \(\pm\)0.20 & \(\pm\)0.01 & \(\pm\)0.47 & \(\pm\)0.05 \\  & 0.86 & 0.21 & 1.06 & 5.23 & 0.11 & 0.09 & 0.01 & 1.15 & 0.14 \\  & \(\pm\)1.50 & \(\pm\)0.42 & \(\pm\)1.90 & \(\pm\)3.60 & \(\pm\)0.30 & \(\pm\)0.13 & \(\pm\)0.01 & \(\pm\)0.89 & \(\pm\)0.13 \\  & 0.92 & 0.26 & 1.17 & 9.70 & 0.16 & 0.10 & 0.01 & 1.44 & 0.18 \\  & \(\pm\)0.59 & \(\pm\)0.23 & \(\pm\)0.81 & \(\pm\)14.6 & \(\pm\)0.16 & \(\pm\)0.08 & \(\pm\)0.01 & \(\pm\)1.28 & \(\pm\)0.10 \\ \hline \multicolumn{10}{c}{Daily} \\ \hline RS & 1.44 & 0.82 & 2.26 & 1.86 & 0.42 & 0.39 & 0.02 & 1.23 & 0.12 \\  & \(\pm\)1.31 & \(\pm\)0.73 & \(\pm\)2.03 & \(\pm\)0.63 & \(\pm\)0.34 & \(\pm\)0.40 & \(\pm\)0.03 & \(\pm\)0.43 & \(\pm\)0.11 \\  & 0.89 & 0.23 & 1.12 & 7.47 & 0.14 & 0.10 & 0.01 & 1.