Characteristic of polycyclic aromatic hydrocarbon concentrations and source identification for fine and coarse particulates at Taichung Harbor near Taiwan Strait during 2004–2005

Autumn and Wintertime Polycyclic Aromatic Hydrocarbons in PM2.5 and PM2.5-10 from Urumqi, China

“…The 5 + 6-rings PAHs were much richer in PM 2.5 than PM 2.5-10 in both seasons. The carcinogenic 5 + 6-rings species are predominantly associated with particles especially in the accumulation mode (0.5 μm < d < 1.0 μm) (Fang et al, 2006). …”

The Mass Distribution of Particle-Bound PAH Among Aerosol Fractions: A Case-Study of an Urban Area in Poland

“…The second maximum occurred usually between 0.65 and 1.0 μm (except for BbF, BkF, BaP) and the third one between 4.4 and 6.8 μm or 6.8 and 10 μm (except for BaA, IP, DBA and BghiP). Three-ring PAH, in winter and in summer, were not detectable in some PM fractions (Table 1) because the lighter than Ph ambient species occur in the gaseous form (Guo et al, 2003;Fang et al, 2006;Akyüz & Çabuk, 2008). In summer, ΣPAH and, in general, four-, five-, and six-ring PAH (Fl, Py, Ch, BbF, BkF, BaP) had tri-or bimodal distributions.…”

Traffic-Related Air Pollution: Legislation Versus Health and Environmental Effects

“…Temperature is probably the most important physical parameter that influences distribution of PAHs between particulate and gaseous phases. Temperature increase promotes vaporization of PAHs and gaseous PAHs are more likely to be subjected to transformation and reduction by photochemical degradation (Fang et al, 2006;Tsapakis & Stephanou, 2005). PAH decay under low outdoor humidity conditions was slower than at high humidity (Kamens et al, 1988;Tsapakis & Stephanou, 2007).…”

“…PAH decay under low outdoor humidity conditions was slower than at high humidity (Kamens et al, 1988;Tsapakis & Stephanou, 2007). In the presence of sunlight PAHs can undergo a photo-oxidation reaction that is recognized as one of the important removal process of PAHs from the atmosphere (Fang et al, 2006). Finally, the levels of other pollutants also influence the transformation of PAHs in the atmosphere and the reaction of ozone and PAHs is considered as a degradation process of these compounds, reducing their atmospheric concentrations (Park et al, 2002;Tham et al, 2008).…”