What's the difference between dog days and dog days?

The difference between dog days and dog days lies in the hot and humid weather.

The dog days appear between the light summer heat and the heavy summer heat, and are the days with the highest temperature, humidity and sultry weather in a year. V means latent. The "crouching" of "dog days" means "crouching evil". That is, the so-called "six evils" (referring to "wind, cold, heat, dampness, dryness and fire"). The so-called "dog days" refers to the "dog days" of the lunar calendar, which is the hottest period of the year.

Six dog days is probably the high temperature in summer. The weather is very hot and the humidity is higher than before. The days are long and the nights are short in summer. Before sunrise, green plants can't get photosynthesis, so there will be a lot of carbon dioxide and the air is not so fresh. At dawn, there will still be a lot of summer pollutants in the air, which have not completely spread before six o'clock.