低濕度及其對空氣傳播感染的影響

當他們呼吸，談話，咳嗽或打噴嚏時，每個人都會釋放出叫氣溶膠的微小水滴。顯微鏡液滴由約97％的水和3％溶質 - 鹽，蛋白質和許多其他物質組成。

Under normal circumstance, this personal contribution to the "air we share" has no negative effect on us.然而，當一個人有呼吸病毒或細菌感染時，它們的呼出空氣將含有有害的傳染性微生物。曾經發射到空氣中，這些有害的微生物可以通過直接吸入或通過沉積到表麵和隨後的觸摸接觸來感染別人。

The humidity of air is a major factor in the transmission of airborne microbes.

在低於40％RH的幹燥環境中，RH驅逐液滴通過蒸發迅速失去水分含量。由於較小的液滴保持空氣較長，但這種蒸發導致更多的液滴能夠保持空氣傳播並增加它們可以漂浮的總時間。

液滴的水分損失也將其結構變為結晶固態。病毒和細菌在浮膠囊中保存，在那裏它們保持傳染性，並且具有更大的潛力來感染別人。

In an atmosphere above 40%RH, expelled droplets retain their moisture content, are heavier and less able to remain airborne. Furthermore, the dissolved salts inside the remaining airborne droplets create a hostile environment for any suspended microbes, decreasing their infectious nature and any risk they pose to health.

濕度高於40% rh打擊空中感染by reducing the quantity of microbes in the air and inhibiting their infectious capability.