What is the difficulty in breathing in rainy or sultry weather?

In rainy or muggy weather, the air pressure will drop. The influence of low pressure on human physiology mainly affects the supply of oxygen in human body. People need about 750 mg of oxygen every day, of which 20% is consumed by the brain, because the brain needs the most oxygen. When the natural air pressure drops, the oxygen partial pressure in the atmosphere, the oxygen partial pressure in alveoli and the arterial oxygen saturation all drop, which leads to a series of physiological reactions in human body. At the same time, the change of air pressure will also affect people's psychological changes, making people feel depressed and depressed. For example, in rainy and snowy weather with low air pressure, especially in hot and humid weather before thunderstorm in summer (when the air pressure is low), people with poor cardiopulmonary function will feel extremely uncomfortable, and normal people will also feel depressed and uncomfortable. And this kind of suffocation and depression will make people's autonomic nerves tend to be nervous, release adrenaline, cause blood pressure to rise, heartbeat to accelerate, shortness of breath and so on.