the most dangerous volcanic products are?

Answer 1

The gases produced by the magma rising. The hot gases erupt and rush down the volcano as a pyroclastic flow. They are so hot and poisonous that nothing can survive them.

Answer 2

The T shirts that say "I survived the earthequake of (pick a date)"

Answer 3

Toxic gasses, CO2, sulphur etc.
Pyroclastic debris, rocks dust both solid of molten
Vulcanologists, both alive and dead.