Table 3.

OPE levels in PM2.5 filters (expressed in ng/filter) from experiments to evaluate the inhaling fraction of OPEs via use of masks (tested for 6 h, equivalent of volume inhaled by an adult in 4 h).

	TEP	TClPP	TDClPP	TPHP	TNBP	DCP	2IPPDPP	T2IPPP	TEHP	ΣOPEs
Surgical masks
M13 indoor M13 outdoor	nd nd	nd nd	nd nd	nd nd	nd 0.82	nd nd	nd nd	nd nd	nd nd	nd 0.82
Self-filtering masks – KN95
M11 indoor M11 outdoor	nd nd	nd nd	nd nd	0.38 nd	0.64 nd	nd nd	nd nd	nd nd	22.9 nd	23.9 nd
Self-filtering masks – FFP2
M16 indoor M18 indoor M18 outdoor	nd nd nd	4.36 11.6 nd	nd nd nd	nd nd nd	1.36 1.33 nd	nd nd nd	nd nd nd	nd nd nd	nq nd nd	5.72 13.0 nd
Self-filtering masks – FFP3
M10 indoor M10 outdoor	nd nd	nd nd	nd nd	nd nd	1.39 2.19	nd nd	nd nd	nd nd	nd nd	1.39 2.19
Reusable masks
M7 indoor M8 indoor M12 indoor M12 outdoor	nd nd nd nd	nd nd nd nd	nd nd nd nd	nd nd nd nd	nd nd nd nd	nd nd nd nd	nd nd nd nd	nd nd nd nd	nd nd nd nd	nd nd nd nd

nd: below limit of detection.