So, they burn up on re-entry so that there is no ground debris. That means they are creating air pollution. We are literally breathing in Elon’s space junk and/or the remnant micro-particles are deposited worldwide. What is the impact of that?
You sound ridiculous. A few small satellites burning up during reentry is not a health concern.
Given the size of earths atmosphere and the low density of land vs ocean. Earth is literally the blue planet from space we are an ocean planet with small clusters of land. The Pacific Ocean takes up half the planet’s surface you can view the earth from an angle over the Pacific were all you would see is water. That said these sats are mostly aluminum,Silicon,iron,and polymers. The first three are the most abundant element’s in the earths crust littearly everywhere all the time you can go to your back yard pick up any hand full of dirt it will contain those three element’s in quantity that means the dust that coats your shelves inside yup loaded wirh those three element’s. These sats represented 15000 kg or so of mass that will be spread over an area as large as the Pacific which statistically is were they will come down anyway given its half tbe planet size. Compare this to the amounts of meteorites and micro meteorites that enter the earths atmosphere every day. The earth pulls in 40,000 tonnes of soace dust and micrometorites every year that’s 40,000,000 kg all of that is turned into micro particles and drifts down via gravity. In fact a sizable percentage of that dust on your wooden shelves is space dust the very same particles that entered the earths gravity well and are settling down every day everywhere. In short its a huge nothing burger. Cheers
https://scitechdaily.com/earth-loses-50000-tonnes-of-mass-every-year/amp/