Replying to Avatar R5ZM2

Remember anyway the we receive huge amount of cosmic dust mostly made of iron. I would be worried more about aluminium, lead and other elements that do not belong to the surface of the planet or to the sky

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Fair point, people also talk of sand dust blowing from as far away as the Sahara, I recall Europe once having orange/red skies from a Saharan dust cloud but many people in the UK are noticing a massive increase of atmospheric pollution on their cars even if only parked up for a day or two.

Yes I have seen that too. I was almost to the point of buying a spectrometer