* The author is part of the community of readers of La Vanguardia
With thermal immersion, all the gases cannot rise upward and remain stagnant at a low level, as seen in these images in La Vanguardia Readers' Photos captured in Torelló, in the Osona region.
With the difference in temperatures between the elevated area and the valley, smoke and fog are trapped and cannot rise upward.
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 some areas of Osona, the fog or Pubilla de Vic is also known as "baixa joke", because the sea of low fog covers the entire landscape. In this case we can see that it is trapped and cannot go up.
The thermal inversion and the anticyclone worsen air quality, with haze mixing with smoke and pollution.
