The Palmer fire department and Alaska Department of Environmental Conservation are investigating. According to the news story the “Initial investigation indicates the smell is either steam being released from decaying building materials, or smoke from materials buried there that are on fire there, according to various sources contacted for the story.”
In my experience, and according to industry research, the degradation of drywall a/k/a gypsum wallboard or sheet-rock, can often result in the production of hydrogen sulfide gas which has a characteristic rotten egg smell.
We have represented hundreds of families across the country who have lost the use and enjoyment of their homes from the constant bombardment of hydrogen sulfide and other noxious landfill gasses. Feel free to contact us through our website or give Environmental Lawyer Zak Johnson a call at 904-553-7193.