Possible future impacts of elevated levels of atmospheric CO 2 on human cognitive performance and on the design and operation of ventilation systems in buildings

This paper brings together a rapid evidence assessment of impacts of elevated CO 2 concentrations on human cognition with IPCC projections of atmospheric CO 2 concentration by the end of the present century, and an analysis of potential consequences of increased atmospheric CO 2 concentrations for ventilation systems in buildings and other enclosed spaces. Whilst only limited research has been done on the effect of CO 2 on cognition (as opposed to air quality in general), half of the studies reviewed indicate that human cognitive performance declines with increasing CO 2 concentrations. Hence, given the likelihood of increasing atmospheric CO 2 concentration by the end of the 21st century, direct impacts of anthropogenic CO 2 emissions on human cognitive performance may be unavoidable. Attempts to minimise these direct impacts are likely to result in significant indirect impacts on the engineering of ventilation systems and associated energy use in all enclosed spaces including buildings and transport systems. Practical application: This paper concerns what may well be one of the most important long-term drivers of the design, management, operation and regulation of ventilation systems over the remainder of the 21st century. It will be relevant to professionals, particularly at senior levels in the building industry.