International/national standards or guidelines for Indoor Air Quality (IAQ) assessment using CO2 concentration

[hqrrr]

The international / national standards or guidelines for Indoor Air Quality (IAQ) assessment using CO2 concentration, supported by Carbonfly, are as follows:

1. EN: European standard CEN/EN 16798-1, based on german version DIN EN 16798-1:2019 (Page 55). Evaluation based on CO2 concentration differences between indoors and outdoors.

   • [Index = 1] Category I: delta(CO2) <= 550 ppm
   • [Index = 2] Category II: delta(CO2) <= 800 ppm
   • [Index = 3] Category III: delta(CO2) <= 1350 ppm
   • [Index = 4] Category IV: delta(CO2) > 1350 ppm

2. LEHB: Japanese law for environmental health in buildings (LEHB). Evaluation based on CO2 concentration indoors.

   • [Index = 1] Acceptable: CO2 <= 1000 ppm
   • [Index = 2] Unacceptable: CO2 > 1000 ppm

3. SS: Singapore standard SS 554:2016 (Page 22). Evaluation based on CO2 concentration differences between indoors and outdoors.

   • [Index = 1] Acceptable: delta(CO2) <= 700 ppm
   • [Index = 2] Unacceptable: delta(CO2) > 700 ppm

4. HK: Hong Kong Environmental Protection Department. "Hongkong Guidance Notes for the Management of Indoor Air Quality in Offices and Public Places" (Page 17). Evaluation based on CO2 concentration indoors (averaging time 8-hour).

   • [Index = 1] Excellent Class: CO2 <= 800 ppm
   • [Index = 2] Good Class: CO2 <= 1000 ppm
   • [Index = 3] Unacceptable: CO2 > 1000 ppm

5. UBA: German environmental protection agency (Umweltbundesamt). "Gesundheitsschutz 11-2008: Gesundheitliche Bewertung von Kohlendioxid in der Innenraumluft" (Page 1368). Evaluation based on CO2 concentration indoors.

   • [Index = 1] Hygienically safe: CO2 < 1000 ppm
   • [Index = 2] Hygienically conspicuous: CO2 <= 2000 ppm
   • [Index = 3] Hygienically unacceptable: CO2 > 2000 ppm

6. DOSH: Department of Occupational Safety and Health (DOSH) Malaysia. "Industry Code of Practice on Indoor Air Quality 2010 (ICOP IAQ 2010)." Evaluation based on CO2 concentration indoors.

   • [Index = 1] Acceptable: CO2 <= 1000 ppm
   • [Index = 2] Unacceptable: CO2 > 1000 ppm

7. NBR: Brazilian standard ABNT NBR 16401-3:2008 "Air-conditioning installations – Central and unitary systems – Part 3: Indoor air quality" and ABNT NBR 17037:2023 "Indoor air quality in artificially heated non-residential environments – Referential standards". Evaluation based on CO2 concentration differences between indoors and outdoors.

   • [Index = 1] Acceptable: delta(CO2) <= 700 ppm
   • [Index = 2] Unacceptable: delta(CO2) > 700 ppm

If you know of any other IAQ standards, please comment below.