The two sites employ a total of 68 workers and produce 44,000 tonnes of tissue paper annually.
Under provincial legislation, the kraft pulp mill has less than 15 months to overhaul how it processes wastewater.
Vancouver-based company said the scale-back is a temporary measure.
Deal is expected to close in the fourth quarter of this year
ND Paper LLC has agreed to buy the mill and to offer employment to the Fairmont mill employees.
Closures to take place by year-end will affect about 65 workers in Barrie and Peterborough.
Plan required to prevent further discharges of power boiler ash slurry into a ditch.
Investments will be made over five years; Trudeau claims at least 5,000 jobs to come.
Northern Pulp has until 2020 to replace its current effluent treatment plant in Boat Harbour near Pictou.
Victory in the latest trade battle will only be secured if Canada uses all of the weapons in its arsenal.
Cat-HTR technology will be used to produce biofuels and biochemicals.
Environmental Damages Fund will disperse the money to three groups.
Shutting Georgia machine permanently, cites vulnerability to strong US dollar.
New precipitator is working, other emissions down as well.
Port Hawkesbury Paper said the interim duty of 20.33% is unfair and without merit.