The largest city in Brazil was plunged into darkness in the middle of the day on Monday after billowing smoke from ongoing wildfires in the Amazon region combined with a weather pattern, creating an ominous, dark blanket over the metropolis.

The thick, black clouds moved over Sao Paulo around 3 p.m. and stayed over the area for more than an hour.

Officials from Brazil’s National Institute of Meteorology, known as Inment, said the phenomenon was due to the combination of several factors: a cold front, humid air, heavy clouds, and winds bringing particulate matter from ongoing wildfires in Paraguay and Bolivia.

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“The darkening of the sky was quite intense,”…