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ERIC PIERMONT / AFP

The Anses health agency gave a mixed opinion on the Dim brand masks, distributed in particular to teachers and accused of being treated with toxic products.

The analysis did not reveal a risk to health, "on the assumption that the precautions for use are strictly observed".

The health agency recalls that it "was seized urgently" to estimate the potential risks of these washable fabric masks treated with two antimicrobial active substances, silver zeolite and silver and copper zeolite.

These biocidal products have been accused of being toxic by the news site Reporterre.

The Ministry of National Education suspended the distribution to teachers of these controversial masks on October 20, pending the results of an expertise.

Conditions of use to be respected

At the end of its expert appraisal, ANSES "ruled out the potential for immediate and serious harmful effects on human health, a finding supported by the absence of reporting to the poison control and toxicovigilance centers of proven adverse effects on human health. wearing these masks ”.

For the medium-term risks, it concludes that "in the event that the precautions for use are scrupulously respected, the wearing of these masks does not present any harmful effect on human health, in particular toxicity for reproduction".

"These precautions include washing before first use and after each use, wearing for a maximum of 4 hours and replacing masks as soon as they are wet," she explains.

However, taking into account the situations that may exist in everyday life, such as wearing masks without prior or wet washing, and "" worst case "scenarios", the health agency considers that medium-term toxicological effects such as "l The accumulation of Ag + silver ions in the organs can result from these exposures ”and that“ health risks cannot therefore be totally ruled out ”.

Supervise the use of biocides

It notes that chemical treatment with biocidal substances is not a technical requirement for fabric masks.

Manufacturers are not required to mention these treatments on the labels.

The use of antimicrobial treatments, in particular in everyday consumer products, needs to be better supervised, she continues, indicating that the implementation of the Biocidal Regulation contributes to this.

Finally, ANSES recommends speeding up the evaluation of active substances at European level so that the treated articles contain only those which are approved and suitable for the product.

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