Spain's capital of Madrid has been enveloped in clouds of smog after cold air has accumulated at low altitude bringing pollution to the city.

The footage was captured on January 3.

The pollution beret that Madrid is drawn on the head every time the weather is anticyclonic will remain for at least another week, with the risk that it will end up triggering the high pollution protocol and traffic restrictions . Meteorology warns that the air quality will be in this season "very bad", These "little nuances" will not affect Madrid, where at least until the middle of next week is not expected to rain or wind, the "two only factors that, from the Meteorology, can end the beret ". The other way, remember Aemet, is to reduce pollution. As of day 9, it is not going to improve the situation, but the uncertainty increases and changes are possible. There are several factors, one of the main ones being that, with anticyclonic time, the air tends to stabilize, which ends up causing the phenomenon of thermal inversion ", the more it climbs the colder it gets, but now it is colder in the valleys that on the summits. " The cold air, plus the contaminating particles it contains, stays accumulated in the lower areas. "And as the atmosphere is stable, there is little mixing and pollutants are confined near emission sources, that is, in large cities and industrial areas