Ms Ardern said they were not mandating the use of masks "at this stage" but are actively encouraging their use in Auckland.
The Covid-19 website has been updated to encourage Aucklanders to wear masks when they are "out and about" and on public transport, and for the rest of the country under Alert Level 2 to "wear masks in situations where physical distancing is not possible, like on public transport or in shops".
Masks have only been mandated on flights from Auckland.
It comes as Auckland moves into Alert Level 3 and the rest of the country to Alert Level 2 at noon today until midnight Friday.
It was spurred by four new Covid-19 cases from a South Auckland family acquired through community transmission.
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