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These days we have had thermal inversion and the smoke was trapped between the layer of fog, as we see in the photo and in the accelerated video in La Vanguardia Readers' Photos.
I captured the images in Sant Pere de Torelló, Osona region. On this occasion the temperature was lower in the valley of the River Ges than in the Serra de Bellmunt that we see in the background and, if we look at the photo, we see frost in the foreground.
With the difference in temperatures between the elevated area and the valley, the smoke remained in the fog, as can be seen in the accelerated video images.
Fog is very common in the Plana de Vic, especially at this time of year. Not in vain is Osona the area with the most days a year with this atmospheric phenomenon (at least a hundred).
In this case we can see that the smoke is trapped in the fog and cannot rise. The thermal inversion and the anticyclone worsen air quality, with haze mixing with smoke and pollution.
