The article talks about particulates in the upper atmosphere, about 50 miles up, and mentions the sources as "Some of these dust particles may be the remnants of the countless tiny meteors that collide with Earth's atmosphere on a daily basis, while others were born of volcanic eruptions or pollution before getting carried high into the atmosphere."
Strange that it doesn't mention the particles from satellites burning up during reentry, which have become a subject of discussion in other articles.
Are the reentering satellites expected to enhance the phenomenon of noctilucent clouds?