The atmosphere is not just weather and chemistry; it is also a habitat and a highway for life. An opinion article in AGU Eos argues that the aerobiome—the collection of microbes, viruses, fungi, pollen, and other biological particles in the air—deserves far more scientific attention. These particles can travel long distances, redistribute nutrients, influence cloud formation, and potentially affect rainfall through a hypothesized bioprecipitation feedback cycle, in which vegetation emits bioaerosols that help seed precipitation, which in turn supports more vegetation.
A 2025 consensus report from the National Academies of Sciences, Engineering, and Medicine proposed a framework called continental-scale biology to study ecosystems across large scales, addressing challenges such as biodiversity loss, climate change, and emerging infectious diseases. But the Eos authors contend that the report's vision is incomplete because it largely overlooks the aerobiome. While the report recognizes teleconnections—links between distant systems—the dynamic role of airborne biological material remains underexplored.
Part of the problem is technical. The atmosphere has extremely low biomass, making sampling, contamination control, and analysis difficult. Molecular tools such as metagenomics have advanced knowledge of microbial life in soil and water, but airborne communities have lagged behind. The authors note that there are still no coordinated national or international programs for regular, standardized aerobiome sampling. They call for integrative monitoring and interdisciplinary research to determine not only which organisms are present, but whether they remain viable and active while airborne, and how they affect Earth systems and public health.