Is it okay to run at 5: 30 in the morning?

The sun has not fully risen before six o'clock, and the photosynthesis of plants has not yet begun. The air contains a lot of carbon dioxide, which is not good for human health. I wonder how old you are. If you are old or have diseases such as high blood pressure, it is not recommended to practice too early, because the air is cold and humid, which is easy to stimulate and induce diseases. In fact, the most suitable time is 10 in the morning, when the air quality is the best and the temperature is relatively stable, but if you don't have time, try to do morning exercises after the sun rises. I wish you good health ~