At the same time the system is reading license plates, and sends notices to big polluters.

与此同时，系统读取车辆号牌，并向高污染车辆发送通知。

San Francisco already uses surveillance cameras for reading car number plates and police officers wear body cameras.

旧金山已经开始使用监控摄像头来读取汽车车牌，警察也会佩戴随身摄像头。