Table 2.

Aerosol particle concentrations (#/m³, Mean ± SD) before and after 5 min of incense burn and after 30 min of observation with ventilation off but portable air cleaner on.

	0.3 μm	0.5 μm	1.0 μm	Total
Baseline	1.0 × 107 ± 6.4 × 106	8.8 × 105 ± 5.9 × 105	1.3 × 105 ± 6.6 × 104	1.1 × 107 ± 7.0 × 106
After incense burn	6.3 × 107 ± 1.3 × 107	1.7 × 107 ± 1.2 × 107	4.6 × 105 ± 2.2 × 105	8.0 × 107 ± 2.4 × 107
Aerosol accumulated (Qe)	5.2 × 107 ± 1.3 × 107	1.6 × 107 ± 1.1 × 107	3.2 × 105 ±2.5 × 105	6.9 × 107 ± 2.2 × 107
After 30 min	9.6 × 105 ± 4.8 × 105	7.9 × 104 ± 3.6 × 104	1.9 × 104 ± 1.7 × 104	1.0 × 106 ± 5.0 × 105
% Aerosol removed*	119.0 ± 13.2	108.3 ± 9.2	150.5 ± 34.7	116 ± 11

^*Aerosol concentrations were lower than the baseline after 30-min, indicating that the portable air cleaner removed all the aerosol particles accumulated from incense burn and some particles already existed in the room at baseline.