As of Dec 2020 “ Inevitably, some of those items will end up in our oceans, where they can wreak havoc on the marine ecosystem. And according to a recent report by conservation organization OceansAsia, the number of face masks that made it into the planet’s oceans this year may be as high as 1.5 billion.”
https://www.greenmatters.com/p/how-many-face-masks-ocean-2020