Should humans or any animal be breathing in aluminium? Isn’t aluminium suggested to be linked to Alzheimer’s? Or is that now a debunked theory?
Aluminum dust in small quantities is not harmful, and the amount a person would breathe or otherwise ingest from such high-atmospheric distribution is negligible. Large amounts -- like if you're grinding or sanding aluminum for extended periods without a mask -- can cause breathing issues, but that's no surprise.
I'm unaware of any connection between aluminum and Alzheimer's other than unsubstantiated rumors on the internet. Medical sources say there's no proven link.