Table 3.

Summary of quantitative standards and guidelines for bioaerosols in air by governmental and private organizations.

Organization	Guideline	Remarks	Reference
American Conference of Governmental Industrial Hygienists (ACGIH)	• < 100 CFU/m3	Low	Macher et al. (1995)
	• 100–1000 CFU/m3	Intermediate
	• > 1000 CFU/m3	High
American Industrial Hygiene Association (AIHA)	There is no safe level of an uncontained pathogenic organism		AIHA (1986)
Commission of the European Communities (CEC)	For houses		CEC (1994)
	• < 50 CFU/m3	Very low
	• < 200 CFU/m3	Low
	• < 103 CFU/m3	Intermediate
	• < 104 CFU/m3	High
	• > 104 CFU/m3	Very high
Healthy Buildings International	< 750 CFU/m3	Total airborne bacteria and fungi is OK if species are not infective or allergenic	Rao et al. (1996)
Indoor Air Quality Association (IAQ)	• < 300 CFU/m3	Common fungi is OK	IAQA (1995)
	• < 150 CFU/m3	Mixed fungi other than pathogenic orexigenic is OK
IAQ in office buildings: a technical guide	• > 50 CFU/m3	One species should be investigated	Malmberg (1991)
	• < 150 C CFU/m3	If mixture of species is OK
The Netherlands/research methods in biological indoor air pollution	• > 104 CFU/m3	Total fungi is a threat to health	Heida et al. (1995)
	• > 500 CFU/m3	One species of potentially pathogenic nature is a threat to health
Occupational Safety and Health Administration (OSHAA)	• > 1000 CFU/m3	Indicates contamination	OSHA (1994)
	• > 106 fungi/g of dust	Indicates contamination
Environment Canada (EC)	•Pathogenic and toxigenic fungi	Unacceptable in indoor air	EC (1989)
	• > 50 CFU/m3	One species should be investigated
	• < 150 CFU/m3	OK if mixture of species
	• < 500 CFU/m3	OK if Cladosporium or other common phylloplane
Ministry of environment (ME), Republic of Korea	< 800 CFU/m3	OK	Ministry of Environment, Republic of Korea (2010)