By Louis Valleau
According to the Gironde prefecture and the regional air observatory, the alert threshold for suspended particles has been exceeded. At 3 a.m., it exceeded 350 micrograms per cubic meter, the alert threshold being set at 80 µg/m³
This is one of the consequences of violent fires. In a press release, the Gironde prefecture assures, this Tuesday evening, that “the alert threshold for airborne particles (PM10) has been exceeded” in the department. A threshold set at 80 micrograms per cubic meter (µg/m³) as a daily average by Atmo, the air observatory in France. “The presence of fumes does not pose any major health risks”, adds the prefecture, which advises not to open the windows and to avoid practicing a sporting activity.
The point in Bordeaux
In Bordeaux, where strong smells of smoke appeared overnight from Monday to Tuesday, the Atmo Nouvelle-Aquitaine confirms this increase in concentration. Based on the figures of four of the five stations available to the regional air agency (the data of the fifth being incomplete), it is possible to observe a strong peak of PM10 between 2 and 6 am . At 3 a.m., when the concentration of suspended particles was the highest, this rate exceeded 350 µg/m³.
At 6 p.m. on Tuesday July 19, everything was back to normal in the Bordeaux area. “It is difficult to assess the situation due to the turning wind,” explains Atmo Nouvelle-Aquitaine. Making the situation uncertain in the coming hours.