I'm curious as to what the filters in B&Q respirators contain. Their website being crap, I can't find a link, but I refer to the masks with a rubber bit that fits over mouth and nose, with two round filters on either side - one for dust and the other for vapour.
I tend to get shortness of breath from solvent and paint fumes. This week I had it particularly badly (still have, in fact), so I bought one of the above. The first time I used it, I found that after breathing through it for a few minutes, I could expand my lungs a lot better. The effect didn't last for long after I stopped wearing it.
So I'm left wondering what's in the filters, and whether something there is acting as a bronchiodilator.
I think my current episode is connected to naphtha in wood dye, so I'm using water-based from now on.
Cheers Richard