Please understand that i hate MDF and the dust that comes from working with it. However the referenced European countries and for that matter the state of California are totally insane with their regulation of every substance known to man!
By the way im not trying to dismiss the fact that there are all sorts of hazzards out in the world. MDF bothers me so much i try to avoid it at all cost. What frustrates me is materials being designated hazardous by default with out any sound evidence or massive overreach to address known problems.
Nothing was said otherwise. The use of compressed air or flood coolant for other materials to clean swarf from a channel is normal practice. You have to do something to prevent chip recutting.
That may be true or maybe the result of some government employee trying to justify his job. If you consider that just about every product now marketed in the USA has a sticker on it claiming that the state of California knows that this product causes cancer you have to question the credibility of the designation.MDF is a harmful substance and a classified carcinogen, it contains among other things, formaldehyde. and is a banned substance in many European countries."
In any event in this case it doesnt matter because dust extraction would still be used, the compressed air is there to lift the swarf out of the cut to be vacuumed up.
Lead is a perfect example of massive overreach. Yes very dangerous to people, especially children. However that lead has to get into their bodies some how and frankly it wont come from the solder on a circuit board. Regulation needs to match the risks involved.
In a nut shell when working with machinery one should assume that all dust is a problem and act accordingly. Otherwise we get into labeling some dust as bad or worse than others.