Does co2 rise or fall indoors?

Indoor CO2 levels can rise due to factors like human respiration, combustion processes, and inadequate ventilation. When spaces are poorly ventilated, CO2 can accumulate, especially in crowded or enclosed areas. Conversely, in well-ventilated environments, CO2 levels can decrease as fresh air dilutes the concentration. Therefore, the trend of CO2 indoors largely depends on ventilation and occupancy.