Assuming you mean “seen by humans” and in historic time, most would agree that was Tambora in Indonesia, in 1815. It ejected about 80 times as much ash as Mt St Helens in 1908.
The largest ash cloud in recorded history probably came from Mount Tambora in Indonesia. It erupted on April 15, 1815 and produced anywhere from 100-150 cubic kilometers of rock and ash, making it the largest eruption in modern history. Mount Tambora spewed so much ash into the atmosphere that it produced the famous “Year Without a Summer” in 1816.
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