Ineos Styrolution has begun removing benzene stored at its Sarnia, Ontario, facility as part of a previously announced decision to shut down styrene production at the site.
The facility has been in the spotlight since this spring when residents of the neighboring Aamjiwnaang First Nation complained of health issues related to high levels of benzene in the air. Benzene is converted into styrene monomer, used to make polystyrene and other materials. It's listed as a toxic substance in Canada and as a known carcinogen in the U.S.
Ineos Styrolution first shut down production in April, saying it was a temporary closure for maintenance, but in June said it would permanently end styrene production there "based on the economics of the facility within a wider industry context."
Ineos has maintained that the site operated within regulatory limits.
CBC reports some Aamjiwnaang First Nations residents living near the plant have evacuated while Ineos empties its benzene storage tanks due to concerns over an increased emissions risk.
Ineos told CBC the removal should be completed before Oct. 16, but "any elevated emissions are expected to be localized near the site boundary and are not expected to cause adverse effects to the local population."