Bryan Johnson· Author
Brake-pad PM2.5 was more damaging than diesel PM2.5 to cultured lung cells; causing more inflammation, oxidative stress, metabolic damage, and activation of hypoxic pathways related to cancer and lung fibrosis.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Brake-pad PM2.5 was more damaging than diesel PM2.5 to cultured lung cells; causing more inflammation, oxidative stress, metabolic damage, and activation of hypoxic pathways related to cancer and lung fibrosis.
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Further analysis identified copper in the brake-pads-derived particles as the main driver of the lung cell damage.
Published last week, a study found that small particles released from the wear of copper-containing brake pads were more damaging to human lung cells than similar particles released from diesel motors.