I"m planning on possibly working at Williston, North Dakota, oil fields.
If one knows a good forum or sub-forum, at a different site, that specializes in the area or kind of word, it would be nice to know. City-data seems to be the only good one I can find. Reddit has nothing decent.
Thanks for the response.
I have several of the 3m 6800 series, I'm still alive ! after 5-6 years of using it.
This is the filter suggestion/selection guide, depending on what you'll be expose to.
http://multimedia.3m.com/mws/media/639110O/3m-respirator-selection-guide.pdf
http://multimedia.3m.com/mws/media/815734O/3m-reusable-respirators-product-catalog.pdf
Why do you need to buy a respirator for work? If it's needed, your company should supply any necessary PPE...including respirators.