How opening a window could help you avoid Covid

These fine clouds of particles, known as aerosols, are thought to be able to remain suspended in the air for long periods, even hours. Epidemiologist Antoine Flahault likened dispersing the viral cloud to airing out a room when someone is smoking.

The American Centers for Disease Control updated its advice this week to include guidance on enclosed areas. Experts in other countries have argued for months for more rigorous measures to dispel the threat of aerosol transmission, which were largely absent from public health guidance at the start of the pandemic. Chancellor Angela Merkel said last month that ventilation"could be one of the least expensive and most effective measures to stop the propagation of the pandemic."

"We recommend a total recirculation of the air in a room at least six times an hour. That takes quite a lot," said Flahault, director of the University of Geneva's Global Health Institute.

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