Fog Acts as a Natural Air Filter, Teeming with Live Bacteria

How Microbes Thrive in Fog

According to НВ — Техно: New research reveals that microorganisms living inside fog droplets are not just passive passengers-they actively grow and reproduce. Methylobacteria, in particular, break down formaldehyde within these droplets, effectively turning each one into a tiny air purification chamber. The concentration of live cells in fog matches that found in the world's oceans.

The study was conducted by Thi Thuong Thuong Cao in Pennsylvania's Susquehanna River region, using fog samples collected from open fields. The team focused on radiation fog, which forms on calm nights in low-lying areas and can remain motionless for hours. To analyze the samples, they employed both optical and electron microscopy techniques.

Contrary to assumptions that microbes in fog might be dormant, the researchers found them increasing in size and actively multiplying. Bacteria occupy less than one percent of all fog droplets, yet their density reaches roughly 10 million bacterial cells per thimbleful of water. This points to a surprisingly high level of biological activity within the fog.

Methylobacteria: Tiny Cleaners for the Air We Breathe

One group of bacteria, the methylobacteria, stood out in the findings. Their numbers rose during thick fog events and dropped in dry conditions. Methylobacteria feed on simple carbon compounds, including formaldehyde-a pollutant released by car exhaust, wildfires, and industrial emissions. By breaking formaldehyde down into carbon dioxide, these bacteria play a vital role in improving air quality.

Overall, the study highlights the significant potential of fog-dwelling microorganisms to cleanse the atmosphere, opening up new avenues for exploring biological processes in natural settings.

This research underscores the importance of microbes in natural ecosystems and their contribution to air purification. As global warming and atmospheric pollution intensify, understanding the biological activity within fog could help shape new environmental strategies for cleaner air. The researchers hope these discoveries will lay the groundwork for further studies in this field.