Harvard Study Links Poor Office Air Quality to Reduced Employee Cognition and Productivity

Summary

A year-long study conducted by Harvard T.H. Chan School of Public Health involving over 300 office workers across six countries has found that poor indoor air quality significantly impairs cognitive function and productivity. The research, published in Environmental Research Letters, examined the effects of fine particulate matter (PM2.5) and low ventilation rates (measured by CO2 levels) on employee performance, revealing that increased pollutant concentrations were associated with slower response times, reduced accuracy on cognitive tests, and lower overall work output.

The study monitored participants in offices across China, India, Mexico, Thailand, the United Kingdom, and the United States, equipping their workspaces with environmental sensors and using smartphone-based cognitive tests to measure performance in real-time. Two types of cognitive assessments were administered: a color-identification test measuring speed and focus, and an arithmetic test evaluating cognitive speed and working memory. Results showed that both PM2.5 and CO2 levels negatively affected performance on the color-based test, while CO2 specifically impacted arithmetic task performance.

Research fellow Jose Guillermo Cedeño Laurent, the study's lead author, emphasized that these findings represent the first evidence of acute cognitive impairment from air pollution among younger adults, observed at pollutant concentrations commonly found in typical office environments. The research underscores that indoor air quality affects employee health and productivity far more significantly than previously understood, with implications for workplace design and ventilation standards globally.

• The study involved over 300 workers across six countries and represents the first large-scale evidence linking indoor air quality to acute cognitive effects in office settings