http://hn.vernccvbvyi5qhfzyqengccj7lkove6bjot2xhh5kajhwvidqafczrad.onion/stories/36822141
There's about 5000 of them in orbit, so that's 1,500,000 kg. The Earth has about 5.15x10^18 kg of atmosphere. 5,130,000,000,000,000,000 kg of gas. If each satellite aerosolized completely (which it wouldn't, metals would rapidly precipitate out of the air) then they would make up a couple parts per trillion of the atmosphere.