That was part of an edict announced by Jacinda yesterday.

There is a slight little issue with that, however, aside from the fact that there are no cv-19 cases south of Auckland:

Sweden’s Senior Epidemiologist Anders Tengell, who has overseen Sweden’s response to the pandemic while resisting any form of lockdown or mask mandate, says wearing face masks will not stop the spread of the cv-19 virus — article

In the UK, the same type of face masks that the government mandated people wear in shops from last 24 July to protect against the spread of coronavirus specifically state on their packaging that they don’t protect against coronavirus!