Seasonal variation of atmospheric polychlorinated biphenyls and polychlorinated naphthalenes in Japan

摘要: Abstract This study investigated the seasonality of atmospheric polychlorinated biphenyls (PCBs) and naphthalenes (PCNs) in Japan. Polyurethane foam (PUF) disk passive air samplers (PAS) were deployed simultaneously at 55 sites spring 2008, summer 2008 winter 2008/09. Sampler deployment spanned 8 continuous weeks each season. The non-outlier ranges two pollutants (ng/sample) as follows; ∑ 190 PCBs: 6.5–38.6 (spring), 43.5–220.5 (summer) 25.9–136 (winter); 63 PCNs: 0.4–3.9 0.7–7.1 1.1–9.2 (winter). corresponding values PCBs (pg m −3 ): 33–197 222–1125 132–694 PCNs 2.2–20 3.5–36 5.7–47 (winter), when sampling rate 3.5 m 3  day −1 was assumed. Thus, peaked summer, while mostly winter; there an apparent contrast their For PCNs, seasonal variability significant rural than urban sites. Normally, POPs would show relatively increased content due to vaporization effect. appeared deviate from such a trend because overriding input tri-CNs presumably transported long range by northwesterly winds dioxin-like fractions either pollutant reduced about 30–50%.