MANILA - Mayon Volcano in Albay province emitted steam early Wednesday, the Philippine Institute of Volcanology and Seismology said.
In a bulletin, Phivolcs said moderate white steam plumes were observed in the volcano's crater at 6:06 a.m.
The steam plumes are not a cause for concern because increased volcanic activity is generally indicated by gray or dark steam plumes, the seismological office told ABS-CBN News.
Phivolcs added that the steam may have been caused by a drop in temperature due to persistent rains or a decrease in the pressure at Mayon's summit.
Alert Level 1 however was still hoisted over Mayon, prohibiting entrance to the 6-kilometer radius Permanent Danger Zone.
State seismologists said they want to ensure that all parameters are normal before downgrading the alert level.
Phivolcs said it has been keeping a tight watch on the volcano after several rock fall events were monitored there last week.
Mayon's last volcanic activity was recorded in 2014. -- With a report from Karla Thea Omelan, ABS-CBN News