The Barcelona metro implements smart ventilation control to prevent infection

  https://www.youtube.com/watch?v=bpl1Nay-3yw&ab_channel=SENERGroup An innovative pilot test of smart ventilation control will be implemented this summer in the metro network, Transports Metropolitans de Barcelona (TMB), to improve environmental quality, hygiene and passenger comfort in stations. The digitization project has been developed in concert with SENER Engineering, which supplied its RESPIRA® control system....