Scientists know relatively little about particles released into the air when a vehicle driver brakes, though evidence suggests those particles may be more harmful to health than particles exiting the tailpipe.
, University of California, Irvine researchers show how most of these particles emitted during light braking carry an electric charge -- something that could potentially be exploited to help reduce air pollution from vehicles.
"I was very surprised," said Smith."We were also surprised that this has not really been studied given how common cars are in human societies." The new study reveals a problem that may grow as electric cars become more and more common over the next several decades. Electric cars, Smith explained, are not truly zero-emission vehicles, so municipalities need to think about strategies to reduce emissions from brake use as well as tailpipes.
The public health risk posed by brake emissions is not borne equally by a population -- lower-income parts of cities tend to be more traffic-heavy than others, which creates an environmental justice issue wherein certain socioeconomic classes are more exposed to brake emissions than others. Tiny particles such as ice crystals or ash particles tend to oscillate as they settle through the atmosphere. In their experiments, the scientists were able to track non-spherical particles of size ...
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