Stanford researchers track hidden metals in wildfire smoke
Stanford
Smoke hides different toxic metals 0:02
Wildfire smoke is not always the same even when air quality readings look identical. Scientists know smoke is harmful and getting worse as fires increase, but the real question is which chemicals, especially metals, make one smoke plume more toxic than another. A fire burning through land rich in metals produces smoke with much higher metal content than one burning through low-metal terrain, so the same density of smoke can carry very different risks.
Tracking metals through controlled burns 0:30
To understand how metals move from soil into smoke, researchers deliberately burn forested test areas, sampling soil before and after the fire. They use drones and a newly developed sampling system to follow the metals as smoke rises, measuring temperature, carbon monoxide, and carbon dioxide, since the ratio of those two gases reveals how efficiently the fire is burning. Drones let them measure smoke both near the ground and hundreds of feet up, capturing how it changes as it travels.
From data to public warnings 2:01
Because flying thousands of drones everywhere is impractical, the team plans to put ground-based sensors on fire engines, working with firefighting partners to gather widespread smoke data. The goal is an air toxicity index, beyond today's air quality index, telling people the actual metal concentrations and risks so they can protect themselves. The project is backed by the Stanford Sustainability Accelerator, aiming to give both the public and first responders real risk information.
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