• Indoor Air Quality Standard (World Health Organization)

    The World Health Organization (WHO) has publish the guideline for IAQ in office and public area. Many countries is going to concern the IAQ in office and going to set the standard for its own surrounding. CO2 is one of the requirement in the IAQ.

  • Hong Kong Standard

    Starting from 1 July 2019, Hong Kong is going to set an air quality scheme for indoor and public area, one of the requirement is to keep the CO2 level < 1000ppm as a good class and <800ppm as an excellent class.

  • USA Standard

    Recommended value CO2 level by “ASHRAE ” is <1000 ppm.

  • Japan Standard

  • Health Parameter Guide