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According to Phivolcs' latest advisory, the volcanic smog, or vog, was first observed at 12:30 p.m. on Thursday and has persisted since then.
Mayors from 16 cities and one town in metropolitan Manila sent millions of students home due to the smog, some government offices suspended work.
Batangas towns experience zero visibility due to smog
Phivolcs records at least 22 volcano-tectonic earthquakes at Bulusan Volcano starting 5 am of Wednesday, September 20
Sulfur dioxide emissions from Taal Volcano's main crater hit 4,569 tons per day on Thursday, September 21