Laundry hangs everywhere in Havana. Indoors and out. It hangs from railings and balconies and from lines tied between any sturdy posts. It doesn’t matter that the air is filled with 1950’s auto exhaust or that the city air has its own unique odor. Clothes must be washed and dried. I doubt the average Cuban could afford to buy a clothes dryer even if one were available to purchase. So women practice the time-honored tradition of hanging out the wash. I remember my mother doing the very same chore.
Of course its different in Cienfuegos, Cohimar, or Trinidad where the air is fresher, cleaner, and the population is not so dense. It’s not so obvious, but it’s there. It’s the laundry.