Last week I mentioned a trade group was planning to implement a standard/guide (not sure how it will be classified) that will suggest that the industry should use respirators that carry a NIOSH 14G approval rather than the more common 23C respirator. Since all of this has been happening I have received numerous e-mails, calls, and texts asking me “what the heck is the difference” and “why should I care”. Here are my responses for those of you who have the same questions: