When carbon dioxide pressure increases the capacity of hemoglobin to hold oxygen increases or decreases?

When carbon dioxide pressure increases, the capacity of hemoglobin to hold oxygen decreases. This phenomenon is known as the Bohr effect, where higher levels of carbon dioxide lead to a decrease in blood pH, causing hemoglobin to release oxygen more readily. Consequently, tissues with higher carbon dioxide concentrations receive more oxygen as hemoglobin's affinity for oxygen decreases.