Abstract Data were collected in 70 detached houses built in 2011‐2017 in compliance with the mechanical ventilation requirements of California’s building energy efficiency standards. Each home was monitored for a 1‐week period with windows closed and the central mechanical ventilation system operating. Pollutant measurements included time‐resolved fine particulate matter (PM2.5) indoors and outdoors and formaldehyde and carbon dioxide (CO2) indoors. 

 

 

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