There is speculation that the mysterious black rain that Japan had a few months ago was from China cremating bodies, and in particular, mass cremations from coronavirus victims.

Was this black sooty rain caused by mass cremations?

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    Probably the mass of the bodies would be far to small, but biomass burning does contribute to black carbon. Not sure if there are any forest fires in the area at the moment. Perhaps a starting point for someone answering the question.
    – gerrit
    Commented Jun 18, 2020 at 9:11
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    It seems to have been reported originally by soranews24.com/2020/03/04/… There apparently was a fire in a factory nearby but I haven't checked all the details yet.
    – Entropy
    Commented Jun 18, 2020 at 9:15
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    Very nice. Yes, around this time there was also the reports of 21 million missing cell phone users, which really fueled this. However, I remember seeing recently that a probably reason for the cell phones was due to people cancelling their second phone during covid. I am not sure if this quite makes sense, but it seems at least somewhat "reasonable". During covid I would expect phone use to go up though.
    – user56212
    Commented Jun 18, 2020 at 18:37
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    The daily mail article provides a far more likely but far less exciting explanation: "It later emerged that a 'gigantic' fire had broken out in Hasuda around the time of the rainfall. It was the blaze, at what is thought to be a large commercial building, that was speculated to be the cause of the black rain."
    – Philipp
    Commented Jul 23, 2020 at 9:13


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