Table 3. One-Sided Paired t-Test Comparing Indoor–Outdoor PAH Air Concentrations before, during, and after Wildfires^a.

location	before wildfireb	wildfirec	after wildfired	wildfire average AQI
Seattle, WA 1	0.0025*	N/A	<0.0001*	N/A
Cobb, CA	<0.00010*	N/A	<0.0001*	N/A
Corvallis, OR 1	<0.00010*	N/A	0.0290e	N/A
Carson, WA	N/A	<0.00010*	<0.00010*	21
Newport, OR	<0.00010*	<0.00010*	N/A	70
McCall, ID	N/A	<0.00010*	<0.00010*	73
Alturas, CA	<0.00010*	<0.00010*	N/A	90
St. Helena, CA	0.043	<0.00010*	N/A	93
Prineville, OR	N/A	<0.00010*	<0.00010*	95
Sandpoint, ID	<0.00010*	0.473	<0.00010*	116
Richland, WA	0.0010*	0.15	<0.00010*	135
Seattle, WA 2	N/A	1.0	0.76	142
Sunriver, OR	N/A	<0.00010*	0.057	184
Lake Oswego, OR	<0.00010*	0.69	0.0015*	189
Corvallis, OR 2	N/A	1.0	0.18	220

^aSignificant p-values indicate that vapor-phase PAH air concentrations indoors are significantly greater than those outdoors. α values are Bonferroni-corrected for each sampling event.

^b*Significant when probability <t at α′ = 0.0056.

^c*Significant when probability <t at α′ = 0.0042.

^d*Significant when probability <t at α′ = 0.0042.

^ePotential impact due to backyard campfire near the outdoor air sampler.