Dioxins and PCBs are among a "dirty dozen" dangerous compounds known as persistent organic pollutants.
The exhaust is treated at three points, three different ways, to reduce pollutants like mercury and dioxins.
Others say it's high in toxic substances -- mercury, dioxins and PCBs -- and should be avoided.
Residents are concerned that the landfill would produce dioxins - an unwanted by-product of some heating processes.
BBC: NEWS | UK | Wales | North East Wales | Council to decide in landfill row
The military said smoke from the pit exposed troops to toxic emissions, including low levels of cancer-causing dioxins.
Serious concerns have been raised here over levels of highly toxic dioxins in the emissions from the plant.
So far they have documented measureable effects from a host of environmental pollutants including pesticides, fungicides, dioxins and hydrocarbons.
Dioxins are a group of chemicals known to increase the likelihood of cancer.
When anything containing dioxins is burned, the chemicals are released into the atmosphere.
Moreover, they complain that the Metsa-Botnia installation will not use the cleanest available production technology, meaning that it may emit potentially carcinogenic dioxins.
Bill Harper, chairman of the National Beef Association south-west region, spoke earlier of his fears that dioxins could enter the food chain through animals.
In this case, there are fears that dioxins, drifting through the air, could settle on soil or crops and somehow pass into the food chain.
Weiss, a breast cancer oncologist, suggested that everyday pollutants such as chemicals including bisphenol A and dioxins could bombard hormone receptors, causing abnormalities in the breast.
Campaigners worry that incinerators produce dioxins (a highly toxic family of chemicals that can cause cancer and birth defects) and tiny particles of soot (also carcinogenic).
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The technology in the newest plants limits toxic emissions of dioxins, a major issue with incinerators of the past, to levels similar to a backyard barbecue's.
Scientists are working to establish their exact toxicity, but a draft report from the US Environmental Protection Agency indicates dioxins are considered a serious threat to public health.
And it points out that other methods of waste disposal, like putting it in landfills, can pose health risks, and it urges more frequent monitoring of dioxins from incinerators.
On May 27th the Belgian government alerted the European Commission to the fact that high levels of dioxins, chemicals that cause cancer, had been found in eggs and chickens.
When researchers engineered mice to lack the "alternative receptor" which binds to dioxins, the mice, evidence emerged which suggested that this receptor played a role in the immune system, the liver, ovaries and other organs.
Randox had previously warned it was concerned about possible contamination with dioxins and other chemicals and said it may be forced to move some of its production to County Donegal were the incinerator to go ahead.
Brief exposure to high levels of PCBs and dioxins may cause skin lesions and affect the liver (the tolerated daily intake for dioxin is about 1 picogram - one trillionth of a gram - per kg body weight).
Professor Malcolm Parker, and Dr Jan Brosens from the Institute of Reproductive and Developmental Biology at Imperial College, London, wrote in an accompanying commentary that it was still difficult to prove a link between dioxins and human disease.
That is 400 times the accepted limit in Holland, say scientists at a Dutch laboratory, the nearest facility that could test for dioxins and related chemicals. (The tainted fat was also found to contain 781 parts per trillion of dioxin - 1, 500 times higher than the Dutch safe level.) That was then.
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