Why not do morning exercises in winter?

But the main reason is many harmful gases and dust in the air. When the temperature rises in the morning, it generally floats in the sky, and people inhale relatively little. However, after the temperature drops at night, they will settle near the ground and will not disperse in the early morning of the next day, so exercise at this time will inhale more gas into the lungs than exercise before evening, which is more harmful to the body.

It is best to exercise after sunrise. It is best to exercise before evening.