That's because the particles that carry the virus get diffused by circulating air, when people are gathered indoors in tight spaces without good ventilation that increases the likelihood of spread.
Normally you're in this outside well-ventilated space and on a windy day, it's probably not going to be an issue until you put the cuttings into the boot of your car to take to the tip.
I'm sorry. We can not regulate the air-conditioner. As soon as the plane takes off we'll be able to get better ventilation, and the temperature here will drop. Let me get a wet towel at you at the moment.