Scientists studying Covid-19 agree that catching the virus outside is much more difficult than indoors. The virus is typically spread when tiny particles from an infected person are transmitted to another, but that becomes harder in outdoor settings.
Experts say an easy way to understands how the aerosols and droplets carrying the virus behave is to compare it to cigarette smoke.
Inside, the smoke lingers and hangs in the air, but outside, it can quickly disperse. "What Covid likes is dark, cold environments, indoors where there is no UV light," said Nicola Fletcher, assistant professor at UCD's School of Veterinary Medicine. "Outdoors there's greater air movement, so you have greater turnover of air, so less virus is able to linger over