Table 3.

Overall IAQ Chemical and Biological Parameters Results (Indoor and Outdoor) and Reference Levels

		Indoor		Outdoor		Indoor reference levels
Parameter	Season	Average	SD (range)	Average	SD (range)	Portuguesea	International
Formaldehyde (mg m−3)	Summer	<0.0002	—	—	—	0.1	0.1b
	Winter	<0.0002	—	—	—
TVOC (mg m−3)	Summer	0.07	0.09 (0.03–0.5)	0.04	0.01 (0.02–0.06)	0.6	0.2c
	Winter	0.08	0.07 (0.02–0.32)	0.02	0.01 (0.01–0.03)
PM10 (mg m−3)	Summer	0.074	0.04 (0.02–0.2)	0.08	0.02 (0.05–0.11)	0.15	0.05b
	Winter	0.064	0.071 (0.01–0.43)	0.05	0.03 (0.02–0.12)
CO (mg m−3)	Summer	1.3	2.47 (0.01–10.4)	1.2	1.61 (0.01–4.8)	12.5	7b
	Winter	0.5	0.68 (0.01–4.08)	0.8	0.81 (0.01–2.56)
CO2 (mg m−3)	Summer	996	436 (512–3568)	669	91 (512–951)	1800	1080d
	Winter	1196	512 (512–3842)	712	344 (457–3751)
Bacteria (CFU m−3)	Summer	397	237 (6–830)	166	126 (68–336)	500	500b
	Winter	329	280 (32–996)	52	20 (30–84)
Fungi(CFU m−3)	Summer	525	533 (6–2224)	476	726 (20–1314)	500	300e
	Winter	296	263 (90–1218)	225	146 (114–478)

^aDL 79/2006, 4 April 2006 (Decree-Law 2006a).

^bWHO (2010).

^cECA (1997).

^dBurton (1995).

^eRobertson (1997).