You can't breathe when the sun is shining on it.

When the weather is hot, you will feel chest tightness and difficulty breathing. This situation is mainly because: when the weather is hot, the air pressure is low, and in order to maintain normal body temperature, the human body must speed up heat dissipation, so the sympathetic nervous system is excited, the heartbeat is accelerated, breathing is accelerated, and blood vessels are dilated, which will make people feel chest tightness, difficulty breathing, and people feel uncomfortable.