It turns out the hazy skies over parts of the province in recent days weren’t caused by volcanic ash, but volcanic activity in Iceland may still be the cause.

Meteorologist Justin Boudreau of the Gander Weather Office says Fagradalsfjall—the volcano just outside the capital of Reykjavik—is not the explosive-type of volcano that spews out ash.

Boudreau says fissure-type volcanoes, like the one currently active in Iceland, do still emit gases. The aerosols in sulfur dioxide can then attract moisture, creating a visible haze.

A more remote possibility, according to Boudreau, are fires burning in central Europe the smoke from which could be picked up by winds and carried across the Atlantic.