Four people affected by a gas leak at Tassal's Strathblane site remained in hospital on Monday afternoon, as the salmon giant continued to undertake an investigation into the incident.
The patients were in a stable condition and were expected to be discharged this afternoon, Chief Medical Officer Anthony Lawler said.
More than 20 Tassal employees were taken to the Royal Hobart Hospital on Sunday after being affected by the gas leak in the state's far south.
The facility, near Dover, was evacuated as the source of the leak was determined, with the Tasmania Fire Service called to the site about 11.30am.
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The TFS said there was no impact to the broader community and that early assessments indicated the most likely cause of the incident was carbon monoxide "from the operation of forklifts inside the building".
A Tassal spokesperson thanked emergency services for their assistance.
"First and foremost has been the safety of our people," the spokesperson said on Sunday.
"Investigations into the cause are under way by Tassal and by the authorities.
"We have been given clearance from the authorities to recommence operations."
Tassal said it would not be commenting further on the matter until its investigation had concluded.
Clark Labor MHA Ella Haddad said her thoughts were with the injured workers and that she would support the government if it was to make carbon monoxide detectors mandatory on Tasmanian work sites.
"I'm aware that there aren't national standards [for this]," she said. "There are in some other countries."
"So the [state] government needs to work with the federal government on implementing national standards so that people know that they can be kept safe from things like carbon monoxide poisoning."
When asked if the government would consider making carbon monoxide detectors compulsory, government minister Sarah Courtney said she wouldn't "preempt any outcome" of a WorkSafe Tasmania investigation into the incident but that the government would examine the findings "very closely".
The [state] government needs to work with the federal government on implementing national standards so that people know that they can be kept safe from things like carbon monoxide poisoning.Ella Haddad, Labor MP
"Clearly this has been a very distressing incident for those that are involved," she said.
A Justice Department spokesperson said WorkSafe Tasmania had responded to the event at Strathblane and that inspectors had issued notices under the Work Health and Safety Act "in order to prevent any further exposure".
"WorkSafe Tasmania is conducting an investigation in line with the act," the spokesperson said.
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