Question: Why is it dangerous if the air becomes too humid?

Christina Pagel answered on 24 Jun 2013:

I think it’s because we rely on being able to sweat to cool us down… and sweat only works if it can evaporate off our body. The more humid it is, the more water is already in the air and the harder it is for sweat to evaporate. That means it’s not cooling us down so we are in greater danger of overheating…