I think it's a poorly titled article. The salient points for me were: - Braking produces [probably] unhealthy dust. - Much of that dust is electrically charg

I think it's a poorly titled article. The salient points for me were: - Braking produces [probably] unhealthy dust. - Much of that dust is electrically charged, meaning sweeping it out of the air (perhaps before it leaves the wheelwell) is easy. It would be interesting to know whether inhaling charged particles is more or less harmful than neutral particles, though.