We have finally woken up to the importance of air flow in stopping the spread of Covid. Now we need to draft plans for homes, offices and schools that won’t make us sick
When Lidia Morawska goes out for dinner near her home in Brisbane, she takes with her all the essentials: keys, phone, mask — and her carbon dioxide monitor. She puts the device on the table next to her wine glass and waits anxiously for a reading.
The monitor essentially measures how much breath there is in the air. We exhale CO2, so a higher reading indicates more breath, acting as a proxy measure of ventilation and the potential transmission of airborne viruses, including Covid-19.
Even in a busy room, Morawska, a pioneering aerosol scientist at Queensland University of Technology, says good ventilation results in a CO2 reading close to background levels — the amount you’d expect to be there if there weren’t