In Stratumseind, a street in the Dutch city of Eindhoven known for its nightlife, cylinders on lamposts and balconies dispense aromatherapy to deter brawls. After an experiment showed that the smell of citrus helped calm prisoners at police stations, the city is experimenting with this aromatherapy to help police break up fights an average of 400 times a year.
Now as some groups feel the need to protest in the streets, maybe a splash of citrus will calm them down.