SMOG — a gray cloud of atmospheric pollutants from vehicle emissions — blanketed most of Metro Manila and neighboring communities on Friday, forcing the suspension of classes and prompting authorities to advise the wearing of face masks outdoors.

There were initial concerns that the heavy haze was vog — sulfur oxide-laden dust from the restive Taal Volcano in Batangas — but the Philippine Institute of Volcanology and Seismology (Phivolcs) said it was not so.

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