There are fears MIQ workers at Wellington's quarantine facility are being put at unnecessary risk with Covid-19 cases allowed to exercise in an underground car park with no forced ventilation.
All of Wellington's confirmed cases of the delta variant are housed at the Grand Mercure hotel, with the exception of at least one person who is in hospital.
Dr Joel Rindelaub, an aerosol chemist from the University of Auckland, told Ben Strang MIQ workers could be infected through aerosol transmission, and their movements through the hotel should be restricted.
