Aluminum smelter-derived polycyclic aromatic hydrocarbons (PAHs) in outmigrant juvenile Chinook salmon were evaluated in Kitimat Arm, British Columbia, Canada from 2000 to 2004, and in 2015. Decades of continual smelter operations by Rio Tinto resulted in PAH contamination of marine sediments at levels associated with adverse effects in juvenile salmon. Recently, smelter operations have undergone process changes to reduce PAH input to the environment. The PAH concentrations in juvenile Chinook salmon observed in 2000 to 2004, at sites nearest the smelter were comparable to salmon in other urban areas where reduced disease resistance was observed; the levels were lower in 2015 than 2000–2004 suggesting that the recent process changes were effective. Further, these data establish a benchmark for assessing any future changes affecting PAH input and the potential risks to the receiving environment.

2000年至2004年以及2015年，在加拿大不列颠哥伦比亚省的Kitimat Arm评估了移居的奇努克鲑鱼中铝冶炼厂衍生的多环芳烃（PAHs）。RioTinto数十年的连续冶炼厂作业导致PAH污染了海洋沉积物幼鲑中与不良反应相关的水平。最近，冶炼厂的操作已进行了工艺更改，以减少向环境中输入的PAH。2000年至2004年，在最靠近冶炼厂的地方，在奇努克鲑鱼幼鱼中的PAH浓度可与其他城市地区的鲑鱼相比，后者的抗病性有所降低。2015年的水平低于2000-2004年，表明最近的流程变更是有效的。进一步，