Yes, there have been studies that have evaluated the gradient of CO2 concentration in indoor environments. The results of these studies have shown that there can be a significant difference in CO2 concentrations between the floor level and the height of the windows, with the highest concentrations typically found near the floor and lower concentrations near the ceiling. This is due to the fact that CO2 is heavier than air and therefore tends to sink to the lower levels of a room.
It is also important to note that other factors, such as the rate of CO2 generation, the rate of ventilation, and the overall size of the room, can also affect the concentration of CO2. For example, a smaller room with a high rate of CO2 generation and limited ventilation may have higher concentrations of CO2 than a larger room with the same CO2 generation rate but better ventilation.
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