Safety Mask

Just a regular old 3M 6000 series mask with P95 filters would be fine for that. You can get them at Home Depot or Lowe's. They're usually in the paint department

If you know anybody that works in a hospital,ask them to get you a handful of N95 masks.

Those are the ones they use when working around patients with Tuberculosis. That filter out all the nasty $hit you need.

Lowes or HD and get whatever reusable respirator they have, I have a 3M and another brand that accepts 3M filters, cheaper ones work just as well. Keep spare filters available, you'd be surprised how quickly they can load up, especially if you are tearing up sheetrock.

Do not buy a cheap pack of hospital masks from Lowes. It's a mistake. Your concern is not the larger dust particles that you can see, it is the micro particles that cannot be seen, usually 15 micron and lower. I have a two-stage dust collection system in my shop, but when I am doing demo I wear an RZ Mask for most work. They are a quality product for less than $30 and comfortable to wear ( https://rzmask.com/). The only time up upgrade to a full HEPA Respirator Mask is when I am messing with drywall or spraying indoors. Otherwise RZ Mask is just fine.

The expert on dust particles is a guy named Bill Pentz. He publishes a comprehensive dust guide on his website, billpentz.com.

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The N95 masks are not typically used in work environments, because petroleum-based particles can eat through them IIRC. That's why P95 and P100 are used in construction. Hardware stores will typically only carry the P variants

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This. To the OP, this guy knows what he's talking about.

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Do not buy a cheap pack of hospital masks from Lowes. It's a mistake.

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I can vouch for this. That is why I came here.

I appreciate the thoughtful responses.