To educate myself a little I have borrowed this image from Rashid's blog, we live down in the tiny troposphere and that the tropopause is a barrier to things getting above into the stratosphere. Ideas out there for getting things up there include volcanoes, blue lightning strikes, concurrent thunderstorms and forest fires, and lastly gravito-photopheresis (through this it would take 50years for a piece of soot to get to 20-80km up but it has to be less than 1µm). Or panspermia.
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