Health risk (volcanic ash)

Baku, AZERTAC A volcanic eruption in Tonga that triggered a tsunami was hundreds of times more powerful than the atomic bomb the US dropped on Hiroshima during World War Two, Nasa says, according to BBC. The eruption “obliterated” a volcanic island north of the Tongan capital Nuku’alofa, the agency said. Tonga says more than four-fifths…