Bakit biglang napuno ng smog ang metro manila? Saan ito galing? Sa Taal volcano ba talaga? The duration of the volcanic smog due to Taal Volcano’s activity, which has caused class suspensions in many areas in Luzon, including Metro Manila, on Friday, cannot be predicted, according to the Philippine Institute of Volcanology and Seismology (PHIVOLCS). “As long as Taal Volcano is spewing out sulfur dioxide, this will be a recurring threat,” PHIVOLCS director Dr. Teresito Bacolcol told GMA Integrated News’ Unang Balita in an interview on Friday. “Iyong duration po ng (the duration of) sulfur dioxide emission cannot be predicted due to unprecedented levels in the recorded history,” he added. Bacolcol said in the case of Miyake-jima in Japan, it took around five years for its sulfur dioxide emission to slow down. For Taal Volcano, Bacolcol said the direction of the sulfur dioxide emission was drifting towards the west affecting Tuy, Calaca, Balayan, and Nasugbu towns in Batangas. He said local gove