2016 Yes https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/26502459/ Allen, Joseph North America Observational Exposure Study Other Carbon Dioxide (CO2) Volatile Organic Compounds (VOCs) Test Performance On average, cognitive scores were 61% better under Green+ building conditions than in the conventional building conditions for all nine functional domains. These findings have wide ranging implications because this study was designed to reflect conditions that are commonly encountered every day in many indoor environments.