| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4438647 | Atmospheric Environment | 2012 | 8 Pages |
Chemical components of fine particles (FPs; aerodynamic diameter, Dp < 2.5 μm) and ultrafine particles (UFPs; Dp < 0.1 μm) at Japanese and German roadsides were investigated during summer. The UFPs/FPs ratio for organic carbon (OC) concentrations on weekdays was 34.5% and 25.0% at Japanese and German roadsides, respectively, whereas 3.3% and 6.4% for elemental carbon (EC) concentrations, respectively. These results thus indicate a higher OC and a lower EC contribution from UFPs at the Japanese roadside than at the German roadside. In particle samples, OC2 and OC3 constituted a high proportion of UFPs, and pyrolyzed OC and EC1 were predominant among FPs of 0.1 μm < Dp < 2.5 μm. Our results showed roadside environment exist not only primary FPs and UFPs but also secondary FPs and UFPs from photochemical reactions or long-range transport.
► OC2 and OC3 constitute a high proportion of UFPs. ► POC and EC1 were dominant among of FPs 0.1 < Dp < 2.5 μm. ► EC2 contributed to the total EC of UFPs in roadside environment. ► Higher minimum OC/EC ratio of UFP is affected by secondary or background particles.
