Table 2. One-Sided Paired t-Test Comparing Indoor and Outdoor PAH Air Concentrations before, during, and after Wildfires by Ring Size^a.

		LMW PAHs		HMW PAHs
	location	2-ring	3-ring	4-ring	5-ring	6-ring	wildfire average AQI
before wildfires indoorb	Alturas, CA	0.99	0.90	0.10	0.10	0.10	70
	Newport, OR	0.34	0.99	0.83	N/A (n = 0)	N/A (n = 0)	90
	St. Helena, CA	<0.00010b	0.0069b	0.00020b	N/A (n = 0)	N/A (n = 0)	93
	Sandpoint, ID	0.24	0.58	0.57	N/A (n = 0)	N/A (n = 0)	116
	Richland, WA	0.0088	0.25	<0.00010b	0.012	N/A (n = 1)	135
	Lake Oswego, OR	0.019	0.22	0.014	0.038	N/A (n = 1)	189
after wildfires indoorc	Carson, WA	<0.00010c	0.88	0.16	N/A (n = 0)	N/A (n = 0)	21
	McCall, ID	0.36	0.26	0.044	N/A (n = 0)	N/A (n = 0)	73
	Prineville, OR	0.59	0.92	0.090	N/A (n = 1)	N/A (n = 0)	95
	Sandpoint, ID	0.096	0.24	0.74	N/A (n = 0)	N/A (n = 0)	116
	Richland, WA	0.018	0.54	<0.0001c	0.012	N/A (n = 1)	135
	Seattle, WA 2	0.85	0.91	0.011	N/A (n = 0)	N/A (n = 1)	142
	Sunriver, OR	0.14	0.98	0.0050c	N/A (n = 1)	N/A (n = 0)	184
	Lake Oswego, OR	0.085	0.0030c	0.00030c	0.015	N/A (n = 1)	189
	Corvallis, OR 2	0.10	0.93	0.0086	0.032	0.041	220
before wildfires outdoorb	Alturas, CA	0.92	0.95	1.0	1.0	1.0	70
	Newport, OR	0.79	0.16	0.00050b	N/A (n = 0)	N/A (n = 1)	90
	St. Helena, CA	0.033	0.025	<0.00010b	0.016	N/A (n = 1)	93
	Sandpoint, ID	0.50	0.053	<0.00010b	0.0032b	0.0049b	116
	Richland, WA	0.061	0.033	<0.00010b	0.0002b	N/A (n = 1)	135
	Lake Oswego, OR	0.14	0.0054b	<0.00010b	<0.00010b	<0.00010b	189
after wildfires outdoorc	Carson, WA	0.99	0.80	0.99	0.99	N/A (n = 0)	21
	McCall, ID	0.00020c	0.012	<0.00010c	N/A (n = 0)	N/A (n = 0)	73
	Prineville, OR	0.0099	0.051	<0.00010c	0.00080c	0.044	95
	Sandpoint, ID	0.94	0.016	<0.00010c	0.00010c	<0.00010c	116
	Richland, WA	0.99	0.011	<0.00010c	0.00030c	N/A (n = 1)	135
	Seattle, WA 2	<0.0001c	0.0020c	<0.00010c	0.016	0.049	142
	Sunriver, OR	0.19	0.92	1.0	1.0	0.97	184
	Lake Oswego, OR	0.48	0.011	<0.00010c	<0.00010c	<0.00010c	189
	Corvallis, OR 2	0.61	0.00020c	<0.00010c	<0.00010c	<0.00010c	220

^aSignificant p-values indicate that vapor-phase PAH air concentrations during wildfires are significantly greater than before or after. α values are Bonferroni-corrected for each sampling event.

^bSignificant when probability >t at α′ = 0.0083.

^cSignificant when probability >t at α′ = 0.0056.