The Nuance
The Germ-Cleaning Power of an Open Window
Let the breeze blow those pathogens away
Anyone who’s been cooped up in a stuffy, stagnant room can appreciate the simple pleasure of an open window and a fresh breeze. Breathing clean outdoor air may even provide some cognitive benefits: If a space is small and poorly ventilated, there’s evidence that accumulated C02 can cause drowsiness, poor concentration, and other symptoms.
More importantly, open windows can prevent viruses and other pathogens from spreading. A 2019 study in the journal BMJ Infectious Diseases found that windows and other sources of natural ventilation can reduce the transmission of tuberculosis by 72%. And in developing countries, where expensive ventilation systems are not affordable, hospitals often rely on open windows and fans to encourage indoor-outdoor air exchange.
In the midst of the Covid-19 crisis, public health officials in the U.S. are increasingly trumpeting the benefits of open windows and fresh air. The Centers for Disease Control and Prevention (CDC) recommends opening windows to reduce the spread of coronaviruses, and state health departments are encouraging the same measures to slow the transmission of Covid-19, specifically.
