摘要: Ambient monitoring for dioxins and PAHs was conducted at three Californialocations: in the Sacramento Valley while rice straw was being burned nearby, in Fresno during a period of heavy wood burning, and in an industrial area of R... 展开 Ambient monitoring for dioxins and PAHs was conducted at three Californialocations: in the Sacramento Valley while rice straw was being burned nearby, in Fresno during a period of heavy wood burning, and in an industrial area of Richmond. Portions of these samples were combined for mutagenicity assays, and for PAH-derivative analysis. The highest levels were found in Fresno, and the lowest were found in the rice burn samples. For Fresno, the dioxin levels represent some of the highest values found in published reports. PAH levels were much higher than most ambient levels previously reported for California. Very high levels of retene, a marker for coniferous wood combustion, were observed at night. High levels of mutagen density levels, and high levels of PAH derivatives, were also found in the Fresno samples. 收起