Table 3.

PAH and dust loadings in a subset of 20 carpets from which supplementary samples were collected immediately after dry steam cleaning

Carpet cleaning status	Total PAHs GMa	Dust GMa
Baselineb	1.01	0.77
HEPA followed by repeat HEPAc	0.48	0.37
HEPA followed by dry steam without second HEPA vacuuming	0.40	0.33
HEPA followed by dry steam followed by second HEPA vacuumingd	0.33	0.28e

^aThe unit of loading is µg ft⁻² for total PAHs and g ft⁻² for dust.

^bLoadings of total PAHs and dust before carpet cleaning.

^cHEPA–HEPA protocol.

^dHEPA–steam–HEPA protocol.

^eDiffers significantly from HEPA vacuuming only (p = 0.0437) by paired t-test.