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.
While it's true that many people favor low humidity, little rainfall, mild temperatures and a high percentage of sunny days, obviously not everyone agrees. Otherwise, we'd have all of nearly 7 billion people crammed onto the 177-square-mile (459 square kilometers) island of Palau. So rather than follow the lead of popular opinion and risk excluding the non-beach lovers among you, we at aim to please by selecting 10 countries with a little something for everyone. Whether you're a sun worshipper or a puddle stomper, a surfer or a skier, the following countries will have you covered.