Emerging research has linked exposure to diverse airborne microbial communities to healthy human immune systems.1 But few studies have examined how communities of airborne microbes (aerobiomes) vary over time and space2; none are known to have investigated whether these communities change with height from the ground. A recent proof-of-concept study in Environmental Health Perspectives described how the diversity of airborne bacterial communities decreased from ground level to 2m in height in an urban park, noting that the makeup of the communities also varied, depending on height.3
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