. 2023 Jun 2;242:110489. doi: 10.1016/j.buildenv.2023.110489

Table 2.

The particle size distribution ( $F_{i, j}$ ) of speaking and breathing, and $T O L_{i}$ ( $T I L_{i}$ ) of surgical masks, FFP2 masks, and FFP2-WD. FFP2-WD represents that FFP2 masks are well-adjusted.

Respiratory activity and type of masks		$F_{i, j}$
Respiratory activity and type of masks		0.3–1.0 μm	1.0–3.0 μm	3.0–10 μm
Initial particle size distribution (Morawska et al., 2009; Riediker & Tsai. 2020; Harmon & Lau. 2021)	Speaking	57%	37%	6%
	Breathing	72%	26%	2%
$T O L_{i}$ ( $T I L_{i}$ ) (Bagheri et al., 2021)	Surgical masks	67%	35%	9%
	FFP2 masks	53%	25%	7%
	FFP2-WD	24%	8%	1%