. 2015 Mar 4;12(3):2837–2869. doi: 10.3390/ijerph120302837

Table 2.

Projected PM_2.5 infiltration and air tightness of buildings in Nordic countries.

Decade	Building Tightness ^a ACH50	PM_2.5 Infiltration	References
2000	5	59%	Hänninen et al. 2004, 2011, 2013 [58,59,62], Kearney et al. 2014 [65], Gens et al., 2014 [66], Zou, 2010 [67],
2020	3	52%	EC 2012 [63],
2050	1	30%	Erhorn-Kluttig et al., 2009 [64].
2080	1	24%
2100	1	21%

^a average ACH50 in new buildings.