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December 18, 2020 12:10 am

Wildfire Smoke Is Loaded With Microbes. Is That Dangerous?

An anonymous reader quotes a report from Wired: If you're unfortunate enough to breathe wildfire smoke, you're getting a lungful of charred plant material, noxious gases, and -- if the fire tore through human structures -- incinerated synthetic materials. All across the board, it's bad stuff, proven to be a severe detriment to human health, particularly for those with respiratory conditions like asthma. And not to pile on the worries, but that haze also turns out to be loaded with microbes like bacteria and fungi. The problem is, scientists have only just begun to study this smoky microbial community. That led a pair of researchers to publish a new perspective piece in the journal Science today calling for a multidisciplinary push to better characterize these microbes and determine how they might be making wildfire smoke even worse for human lungs. "It's not just comprised of particulate matter and gases, but it also has a significant living component in it," says University of Idaho fire scientist Leda Kobziar, coauthor of the piece. Wildfire smoke may actually spread beneficial organisms for an ecosystem, Kobziar adds, but "what might the consequences be for the spread of pathogens that we know are airborne?" But hold on a tick: Shouldn't the microbes get cooked to death in the flames? Well, that's not giving these microbes any credit. You see, a wildfire burns with different intensities at different spots as it moves across a landscape. "At the smallest scales, complete combustion is coupled with incomplete combustion," says Kobziar. "Even at one centimeter, you could get very high temperatures for long durations, and at the next centimeter, it can be completely skipped, and no heat at all. So that degree of variability provides a lot of pockets in which these microbes could survive fire." Instead of perishing, they hitch rides on bits of charred carbon and in water vapor, as the wildfire's heat propels all of the muck skyward. If they end up in tiny droplets of water, this could well protect them from desiccation as they travel downwind. "We know that microbes attached to dust particles are certainly transported across continents," Kobziar says. "So we have no reason to believe that that's not also occurring in smoke as smoke travels. But how long do they survive, and which ones survive? That is an open question, and that's exactly the kind of research that we're hoping this paper will inspire."

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