But many miners complain that the dust masks and respirators they've been given are often ineffective and even counterproductive.

Source: https://www.lpm.org/news/2023-11-09/as-coal-miners-suffer-and-die-from-severe-black-lung-a-proposed-fix-may-fall-short

It’s Julia’s father, Enrico, who expresses his family’s agony as he sits in his half-finished basement, surrounded by boxes and boxes of pills and oxygen respirators.

Source: https://variety.com/2023/film/reviews/the-quiet-epidemic-review-chronic-lyme-disease-1235605454/

Other studies show that higher-quality masks, such as N95 respirators, are better able to keep the virus out than less well-fitting surgical masks or cloth masks.

Source: https://www.nytimes.com/2023/04/30/opinion/masks-pandemic.html

Sales of virus-filtering respirators coming off pandemic-fueled highs and China’s choppy economic reopening have also weighed on 3M’s results.

Source: https://www.courant.com/2023/04/25/3m-to-cut-6000-jobs-in-ceos-latest-move-to-blunt-sliding-sales/