Fog may look empty and gray, but scientists say it's more like a floating, living bacterial community. In a two-year study of 32 stagnant-air fog events in central Pennsylvania, researchers from Arizona State University and Susquehanna University found that about 1% of individual fog droplets contained bacteria—enough, when taken together, to match the microbial concentration of ocean water. Indeed, "a thimble's worth of fog water has some 10 million bacteria," as ASU News explains. That means fog isn't just carrying microbes; it's providing them with a habitat where they can grow and divide, Popular Mechanics reports. And that has benefits for people and the air we breathe.
One standout group, methylobacteria, appears to be doing atmospheric cleanup. The microbes feed on simple carbon compounds, including formaldehyde, a pollutant linked to ozone damage and respiratory issues. Measurements taken before and after fog events showed methylobacteria levels rising afterward, suggesting they're using pollution as fuel. Scientists are still sorting out how fog behaves in different regions and in the dark, when sunlight-driven chemistry slows. But the study, published in Environmental Microbiology, reframes those low clouds as active ecosystems that can help scrub the air, not just obscure the view. It also suggests that harvesting fog for drinking water could mean "getting rid of our little friends in the air," co-author Ferran Garcia-Pichel tells ASU News.
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