Aucklanders are being asked to wear a face covering when outside the home, and the rest of the country is advised to wear one when in a confined public space, like when using public transport or a supermarket.
Whilst some people have dusted off their sewing machine to make their own, others are buying masks and using them as a fashion statement.
Nanotechnologist and science educator, Dr Michelle Dickinson, also known as Nanogirl, says research shows masks are highly effective if worn properly.
Particles from masked mouths will only travel six centremetres rather than two metres if no mask is worn.
There are three main types of masks: N95 respirator masks, surgical masks and cloth or home-made masks.
Popular New Zealand fashion labels have been selling masks like hot cakes with some designers reporting more than 300 orders daily.
Otara-based Designer Tasha Lee made the switch from making ball and bridal gowns to masks.
She says during the first ever lockdown they sold about 5000 masks and looking fashionable was front of mind, but this time she's only making them in plain black.
Dr Dickinson says N95 masks should be used and reserved for frontline staff, but that quilt or cotton fabric make the best masks if you are looking to buy or make your own.
She says holding up your material to the light is a way good test the effectiveness of a mask whether buying or making. If you can see through it - it's ineffective.
Also using a mask with a valve is a big no no she says and people should stay away from using and buying these.
