Premier Peter Gutwein announced on Thursday morning that the Check-in TAS app is under review.

The use of contact tracing was one of the first public health measures to be vastly scaled back when the Omicron variant started to circulate in the community after the opening of borders on December 15.

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Prior to the reopening, contact tracing was considered a vital tool in managing the risks of COVID in the community. But the definition of "casual" contact was removed, and "close" contact became only those in the same household or who had spent significant time with a case.

Mr Gutwein said he wanted to "flag" possible changes that could stem from the review.

"It's important that we continue to review Public Health requirements. The Check-in TAS app is one such process currently being reviewed," he said.

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"While there's no change - and I want to stress this, there is no change to current policy settings at the moment - a review is underway to determine whether the app should remain in place only for certain high risk settings such as aged care, hospitals, large mass gatherings or festivals, et cetera.

"That work is underway and we'll have more to say in coming weeks as we continue to transition."

A Launceston business had called for the mandatory use of the app to be scrapped, claiming it was harming his business.

State health commander Kathrine Morgan-Wicks last week said it remained a "fantastic" tool in picking up when certain locations were seeing a high number of COVID cases.

More sectors have been added to those that can apply for exemptions for workers who are identified as close contacts.

Mr Gutwein said mining, forestry and timber resource sectors would be able to apply for exemptions from noon on Friday, joining a range of others including education, health and broadcast media.

Businesses who successfully apply as "critical" services can have workers continue to work should they be identified as close contacts, but may only travel to and from their workplace without going to social gatherings.

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Mr Gutwein said forestry was considered "essential" because of current supply chain issues.

"Forestry is probably an easy one. We know that supply chains across the country in terms of building materials are under pressure," he said.

Teachers can apply for an exemption if they are asymptomatic and comfortable to return to school.

National cabinet is expected to consider broadening the definition of "fully vaccinated" to include the booster shot, but Mr Gutwein said it was too early to say when mandates would be considered as a result.

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