Twice as many people are going to workplaces now, compared with the first wave of the pandemic.
It comes as 592 new cases of Covid-19 were reported by the Department of Health, while 10 more deaths have been recorded.
Public health officials say the fall in the number of new daily cases has started to slow.
Professor Philip Nolan, who chairs NPHET's modelling group, says this is partially due to more people going to offices.
Professor of Health Systems at DCU, Anthony Staines, joined Shane Beatty on Breakfast Briefing:
