Regularly opening car windows for 10 seconds can cut the build-up of Covid-19 particles by 97%, a study has found.
Swansea University found the difference in air pressure between the inside and outside of a moving vehicle created a through-draught to suck out the virus.
For driving below 30mph (48kph), opening all four windows is most beneficial.
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But on faster roads, opening two on a diagonal can have an even bigger impact.
Airborne transmission of Covid-19 happens in two ways: Via large liquid droplets coughed out, or through smaller aerosol spray emitted when breathing.
The large particles are heavy enough to fall on to a surface within a few seconds, however the aerosol spray evaporates, leaving the virus circulating in the air for up to an hour.
Project lead Prof Chenfeng Li said it was this aerosol effect which could be easily combatted through his method.
"At low speeds, the difference in pressure is far less, so the air inside the car is highly turbulent. This is further increased by the stop-start nature of town driving and the constant changes of direction.
"In those circumstances, you need the maximum ventilation possible with every available window open."
But even Prof Li was slightly surprised when the team's computer models and wind tunnel-testing revealed the same wasn't true in motorway conditions.