This one event? I'd be mildly surprised if it were even detectable, other than the brief fireball. There is a constant rain of meteors and meteorids - estimated 139/day more than 10 grams hit the surface of the earth every day [1]. I don't know how many more thousands of small bits burn up every day without ever coming close to the ground. So, I'd say it is at least far down in that noise.
Also, if the total mass of the satellite is a ton, vaporizing all if it in the atmosphere would make make a change of less than one part per 1000 trillion, considering that the atmosphere weighs, 5.5 quadrillion tons[2]. So maybe if it was all made of some element that is very rare in the atmosphere, it might get up to a 1-in-a-trillion concentration when it all burned up? But then, it also is now scattered all over so won't even burn up at once, so heavy elements from the first chunks may have already settled out from by the time the later ones arrive.
There's no way I can concoct anything that it is an atmospheric pollution risk. But space pollution, we might be talking Kessler Syndrome [3]; I don't think this will do it, but I'm worried.
So far the only satellite that caused significant pollution was Kosmos 954 that had an onboard nuclear reactor and after deorbiting spread it over 600km of Canada. USSR was fined 6M for the cleanup.
Not very much at all, if you had some kind of RTG burn up in the atmosphere then that might be a different story (although still nowhere near enough to make the atmosphere polluted as opposed to giving some people on the ground a really bad day)
Try not to let it bother you, it's not like you can spend them. When it does rub me the wrong way is when it is without some type of rebuttal or explainer as to why it's a bad comment.
