Concentrations above 5ppm in air can cause serious problems. You might want to look at this paper, if only to see that, commercially, HCl solutions have another name which can be misleading, Muriatic Acid. What happens if muriatic acid fumes are inhaled?
Answer: A palapa is a thatched-roof, open-sided structure (see palapa photo). The material to cover the roof of a palapa typically consists of dried and woven palm-tree leaves. A palapa is sometimes referred to as a grass or tiki hut.
Palapas are similar in many ways to a tiki hut. A palapa and a tiki hut are both made of dried palm leaves, also known as thatch. There are however some key differences. The first is that a tiki hut is usually enclosed on the sides by walls of palm thatch, while the palapa has open sides.