Reference

Assigned protection factors differ by country: OSHA credits every half mask 10, the UK runs a 4/10/20/40 ladder, EN 529 defines nominal factors with national APFs beneath, and Australia gates P3 to full facepieces. One master table, the three cross-border traps, and a four-jurisdiction worked selection example.

AS/NZS 1716 is the Australian and New Zealand respirator standard: P1, P2, and P3 filter classes, certification marks, and the rule that P3 protection requires a full facepiece. This guide covers silica and bushfire selection, the engineered-stone ban, AS/NZS 1715 protection factors, and the N95-to-P2 translation both ways.