The Haute-Garonne prefecture triggered the PM10 suspension particle warning procedure (the diameter of which is less than 10 micrometers) on Sunday, the air quality observatory in Occitan announced in a statement. , Atmo Occitanie.
In this department, the speed was reduced for the day of 20 km / h on roads and highways, according to a tweet from the prefecture.
"The main cause of this pollution is the 'accumulation of suspended particles due to a very stable atmosphere and low wind', explains Atmo Occitanie
"These particles can be emitted by road traffic, heating devices, industries, or can to be of natural origin, "observes the observatory in its communiqué.
The episode of pollution also affects the Tarn department, but at a lower level, the department being placed in information procedure.
the general population, the authorities recommend reducing intense physical activity and sports, and for the vulnerable to avoid traveling along major highways and their surroundings at peak periods.