suffocating

a. 使人窒息的

The heat was tolerable at night but suffocating during the day.

这种炎热的天气在夜晚尚能忍受，但白天就令人感到呼吸困难。

I'm suffocating in here; can't we open a few windows?

我觉得这儿很憋气, 咱们开几扇窗户好吗?