Matt Winiata: Manurewa Local Board Chair on the nitrous oxide canisters sparking concern among residents - Heather du Plessis-Allan Drive

An Auckland local board chair is concerned children are using large nitrous oxide canisters.

The gas is sold legally for whipped cream use, but can also be used illegally as a psychoactive substance. 

The canisters are 3.3 litres, about the same as 300 smaller canisters - known as nangs.

Manurewa Local Board Chair Matt Winiata says after seeing one, he's spotted them littered across streets in his local area. 

"On a 10-minute drive, I came across another 9 of them."

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