Particle counters used for this purpose typically use ISO Standard 4406:1999 as their reporting standard, and ISO 11171 as the calibration standard.
ISO | ISO image | ISO 639-3 | ISO 3166-1 alpha-2 | ISO 216 | ISO/IEC 7816 | ISO 9660 | ISO 10303 | ISO/IEC 42010 | ISO/IEC 15693 | ISO Development Environment | ISO 639-2 | ISO 639-1 | ISO 3166-1 | ISO 26262 | ISO 20022 | List of ISO 639-3 codes | ISO/TS 16949 | ISO New England | Iso Lele | ISO/IEC 8859 | ISO/IEC 7810 | ISO/IEC 646 | ISO/IEC 24744 | Iso-Heikkilä Observatory | Iso H | ISO basic Latin alphabet | ISO 9529 | ISO 9362 | ISO 639 |