Anyone who intends to take part or organise a face-to-face meeting with a colleague, business partner, friend, or acquaintance must select a meeting location that's not in an enclosed space. Outdoor settings where the air has plenty of room to circulate are preferred over air-conditioned cafes and conference rooms; this is because air-conditioning machines circulate the same air within the space, making germs stay airborne for a longer period. If one has to meet in an indoor setting, turn off the air-conditioner and switch on a fan instead and keep the venue well-ventilated by opening windows and doors.