Hmmm.... Last summer (2008), when Pope & Talbot went bankrupt and shut down their tissue paper mill in Halsey, the smell went away. A month later, when a private equity firm bought the mill and restarted it, the smell returned.
It's probably some micro-climate in the north Eugene area that draws the heavier (smell) particulates back to earth. The Oregon DEQ says that both Halsey mills are not in violation of their air pollution permits but also that the DEQ doesn't regulate smell.
Complain to the Lane Regional Air Pollution Authority (LRAPA) at
lrapa@lrapa.org.
Compalin to the Oreogn DEQ at
DEQInfo@deq.state.or.us (they ask that you include your county in the messge).
They'll ignore one voice but may pay attention to many.