Table 1.

Facemasks by Type, Price per Unit, Total Fluorine, and Summed Concentrations of Nonvolatile and Volatile PFAS^a

Type of facemaskb	Price per unitc	Total fluorine (nmol F/cm2)d	Nonvolatile PFAS (nmol F/cm2)	Volatile PFAS (nmol F/cm2)e
SUD	$	<LOD	0.0016 ± 0.00043	<LOD
N95	$	<LOD	0.00054	<LOD
RC-1	$	<LOD	0.0048f	<LOD
RC-2	$ $ $	7100h	0.0050f	0.079h
RC-3	$	<LOD	0.0055	<LOD
RC-4	$	7600h	0.010f	0.85g
RC-5	$ $	17,000f	0.0063f	1.2f
RC-6	$ $	40,000 ± 18,000	0.024 ± 0.0041	0.90 ± 0.057
FF	$ $ $ $	640f	0.042f	4.7f

^aSamples SUD and RC-6 were analyzed in triplicates, and the data are provided as average ± standard error.

^bSUD = surgical single-use disposable; N95 = N95; RC = reusable cloth facemasks; FF = facemask advertised to firefighters.

^cPrice per unit (US dollars): $ = <1−14; $ $ = 14−28; $ $ $ = 28–42; $ $ $ $ = 42–56, as of Dec 2021.

^dLOD = limit of detection (6.8 nmol F/cm²); LOQ = limit of quantification (20 nmol F/cm²).

^eLOD = 0.00027–0.047 nmol F/cm².

^fTotal fluorine or PFAS was measured in all three layers.

^gTotal fluorine or PFAS was measured in two of three layers.

^hTotal fluorine or PFAS was measured in one of three layers.