Is the content of carbon dioxide in the lower atmosphere more in winter or summer? Why?

(Above)

summer

The reason is that winter hours increase, sunshine time is short and photosynthesis is low, especially in China, because coal is dyed for heating in winter.

The concentration may change slightly in different places. According to different places, if there are evergreen plants in that place, the concentration of carbon dioxide will not change much. If there are fallen leaves in winter, the concentration may change slightly in winter. But in general, the concentration will not change much between seasons, because the atmospheric system will automatically adjust. If the concentration is high, the gas with high concentration will naturally flow to the place with low concentration. If the concentration is low, the gas around nature will be replenished to the place with low concentration, so it is generally not too big. But in general, the concentration is high in crowded places and low in sparsely populated places, and seasonal changes have little effect on the concentration of carbon dioxide.