Letter to the Editor
Pulmonary toxicity in rats following inhalation exposure to poorly soluble particles of low toxicity: Testing at excessive concentrations overwhelming lung clearance?

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Funding information

As this is a Letter to the editors, and a reply to the Bos et al. (2019) paper, there is no funding involved. All five authors work at a company producing synthetic amorphous silica. This letter to the editor was therefore prepared in the course of the authors’ employment.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

We are working at companies that produce synthetic amorphous silica.

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