Decreasing in breathing frequency could improve the particle deposition efficiencies. Nonethless, decreasing respiratory volume may enhance the particle deposition efficiency.
若是减少吸入的呼吸流量，微粒子在气管内的沈积效率也会随之增加。
2
The smaller the particle size, the deeper the location of respiratory tract, and thus the greater the harm to humans, then the higher morbidity and mortality.