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I bought five pieces from a store in Lelong who advertised the face mask with N95 spec. This is misleading and a cheating against customers.
GB2626-2006 KN90 is China standard with 90% filtering power for PM2.5 particulates.
AS/NZS 1716 P1 is Australia and New Zealand standard with 84% filtering power for PM2.5 particulates.
Both of them is below 95% filtering power for NOSH N95 standard.
You can ask for refund from the seller and take legal action against the seller for any damages caused to your health.