Aerosols

The 1987 international Montreal Protocol banned many of the chlorine compounds used in refrigerants and aerosols, like hairspray, to lessen the damage. Since then, the size of the ozone hole has slowly declined but remains large enough to produce significant ozone loss.

Covid-19 is transmitted through respiratory droplets or small particles, such as those in aerosols, produced when an infected person coughs, sneezes, sings, talks or breathes.

Lower down in the atmosphere, these aerosols bump into each other and coagulate, and at the same time interact with other, neutral particles.