Abstract
Trace levels of PCDD and PCDF were detected in fog samples collected in Dübendorf, Switzerland. The more chlorinated, less toxic isomers predominated. Octachlorodibenzodioxin (OCDD) was the most abundant congener at 0.3-3 1 ng/L. No 2,3,7,8- TCDD or TCDF were detected. Congener class profiles were similar to those reported for air and rain samples, suggesting similar sources. Higher PCDD/PCDF levels in fog compared with reported levels in rain may be due to enhanced particle scavenging by fog.
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