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. 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.

Source : BBC