You're fifty years late. Doomwatch did an episode called The Plastic Eaters in 1970.

"A plane dissolves in mid-air, its plastic components eaten away. Doomwatch faces its first challenge: to halt the disastrous spread of a man-made virus with the power to melt all plastic."

https://www.imdb.com/title/tt0564476/

I’m relieved I’m not the only one who immediately thought of what could go wrong. I’ll admit I didn’t think of the airborne part but I did immediately think of it escaping the landfills.