Ok they admit significant uncertainty ... Ah yes 300% error ... it's a little more than significant uncertainty
After that it is true that we tolerate a spill of 5000 to 8000 tonnes of lead per year (sources: https://www.30millionsdamis.fr/actualit ... -chasseur/ et https://www.liberation.fr/france/2019/0 ... nt_1704800) in the wild for Hunting in France ... so Notre Dame next door is not much!
Don't piss off a hunter, he's better armed than you!
Notre-Dame fire: a “dynamic map” of lead level analyzes has been published
While acknowledging "significant uncertainty", the authorities estimate that some 150 kg of lead dust released into the atmosphere.
The Ile-de-France Regional Health Agency (ARS) put online on Wednesday November 27 the map of lead dust samples from the ground since the Notre-Dame fire in April, while the latest examinations of screening of children did not reveal new cases of over-contamination.
In addition to this “dynamic mapping”, there is a modeling of the plume of smoke released during the disaster, which ARS commissioned by the French Institute for the Industrial Environment and Risks (Ineris) in order to specify its trajectory towards the west and assess the amount of lead dust it may have entrained.
New direct debits
While acknowledging "significant uncertainty", Ineris estimated that some 150 kg of lead dust released into the atmosphere, for some 460 tonnes of lead in the roof and spire of the cathedral. The plume stretched to Mantes-la-Jolie (Yvelines), and, in the three modeled scenarios, it was the Parisian districts or the near suburbs located on the plume path that were most affected.
The ARS had a hundred additional samples taken during November, following this modeling. In the Yvelines and Hauts-de-Seine, no measurement has exceeded 300 micrograms per square meter (µg / m2), for a “benchmark value” of 5 µg / m000, beyond which the ARS has set up targeted screenings and decontamination operations.
In Paris, all measurements were less than 1 µg / m000, except one (at 2 µg / m1). These measures "do not present any inconsistencies with respect to modeling," said Laurence Rouil, head of the Environmental Modeling and Decision department at Ineris.
The forecourt still prohibited to the public
They also confirm the initial hypothesis according to which the most significant fallout of lead took place in the area of 800 meters around the cathedral - not modeled by Ineris -, by projections during collapses for example, and not by smoke.
Thus the rates found on the forecourt, still closed to the public, are always high, with measures at 30 or even 000 µg / m40, said the regional director of ARS, Aurélien Rousseau. "Several cleaning campaigns have lowered these levels, but not enough," he said, noting that "the very nature of the [floor] covering makes cleaning very difficult." Movement of rubble can also lead to "re-emissions" of lead.
The reconstruction site thus remains "durably monitored", including blood lead tests for people working there, said the ARS official.
No “over-contamination” of lead children
From the fire at the end of October, 1 measurements of blood lead level were carried out on children and adolescents in the districts of Paris closest to the cathedral.
Twelve cases exceeded the mandatory lead poisoning threshold (50 micrograms of lead per liter of blood), "which remains at the level of the general population, but does not present at this stage of over-contamination", declared Mr. Rousseau. In eleven of these twelve cases, "we found a source of contamination at home", in particular due to the presence of lead in Haussmannian buildings, he specified by presenting these results to the press.
Of the 1 other biological analyzes, 060 revealed a threshold of “vigilance” requiring a six-month control of the individuals, confirming the trends previously noted.
Source: https://www.lemonde.fr/planete/article/ ... _3244.html
The map: https://santegraphie.fr/mviewer/?config ... ame_od.xml
