A new study by various Swiss universities shows that aerosols in indoor air can vary in acidity. This acidity determines how long viruses remain infectious in the air – with profound implications for virus transmission and strategies to contain it.

by Peter Rüegg

Viruses such as SARS-​CoV-2, influenza virus and others travel from person to person essentially by hitchhiking on aerosols. These are finely dispersed particles containing liquid suspended in the air that an infected person expels when coughing, sneezing, or simply exhaling, and can be inhaled by someone else.

That’s why it is generally seen as important to ventilate rooms effectively and filter indoor air: lowering aerosol particle concentrations in homes, offices and public transport vehicles can reduce the risk of infection.

Link to article in ETH Zurich by Peter Ruegg



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