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“But the loudest racket comes from columns of fast-moving traffic lining both sides of the street, which runs from the infamous ring road surrounding Paris known as the périphérique and into the city center: the two-note sirens of police cars, the diesel rumble of buses and, worst of all, the high-pitched wail of motor scooters that speed by every few seconds.” To combat the ill effects of urban noise pollution, Paris is deploying automated sensors and cracking down on the loudest vehicles.

+ Researchers at MIT have developed a paper-thin speaker that can be applied to almost any surface like wallpaper, turning objects like walls into giant noise-cancelling speakers.