Reminds me of being in Prague during a ‘Siberian Blast” Christmas week. Never got above five below. We were in a crowded cafe, all the smokers were unfazed. It was hermetically sealed. Every 15 minutes the waitress/owner opened both entry doors wide, circulating the dense smoky air. It was like torture but it had to be done.
That’s ventilation.
“We were in a crowded cafe, all the smokers”
#1 reason I will never visit europe.