TABLE V.

Average values for the background measurements shown in Fig. 8. Additionally, average measurements for the (1–3) μm size group are also provided. The “before” column indicates the average ambient levels measured within a 5-min time window before conducting any flushing experiments, and the “after” column indicates similar measurements taken after concluding all the experiments.

Particle size group	Before	After	Percent change
0.3–0.5 μm	2537	4301	69.5%
0.5–1 μm	201	621	209%
1–3 μm	8	12	50%