Table 1:

PM_2.5 attenuation rates (based on eight trials) and T₉₀ (time for 90% attenuation).

Bedding Material	Filter top	Flowrate through the cage (L/min)	Air exchange rate per hour	Decay/Attenuation rate per hour*	T90 (minutes)**
Pine	present	6	9	51±27	4.8 ± 1.7
Pine	present	20	31	76±11	< 1
Pine	absent	6	unconfined	141±11	< 1
Paper	present	6	9	20±4	7.6 ± 2.1
Paper	absent	6	unconfined	129±20	< 1
Corn	present	6	9	34±14	4.8 ± 1.3
Corn	absent	6	unconfined	196±28	< 1

^*Average of fits for individual trials ± standard deviation; n = 8 for 6 L/min and n = 3 for 20 L/min. Based on exponential fit on the first fifteen minutes of data for filtertop lid present and first five minutes for filter top absent configuration.

^**Average of T₉₀ values rounded to the nearest minute for individual trials