Plants are known to supply oxygen for the respiration of all living organisms. It is also known that

Plants are known to supply oxygen for the respiration of all living organisms. It is also known that in winter in our zone, most plants do not photosynthesize oxygen do not emit oxygen: they do not have leaves. How then can you explain that we are not experiencing a lack of oxygen at this time of the year?

First, all plants produce oxygen: conifers, which do not shed their foliage for the winter, aquatic plants (algae), and not only deciduous ones.

Secondly, the air is constantly mixed, and the one that is rich in oxygen mixes very quickly with the one that contains little oxygen, thanks to which it is evenly distributed throughout the atmosphere.