Because we were well hard.
Nah, the boss was/is a bit of an arsehole. We did have these really shit paper type ones but they didn’t really protect too well and made it hard to breath and caused your face to sweat heavily. I used to just cover my face with my t-shirt or something but the dust probably floated around for a while after.
It didn’t help that we couldn’t open the windows because he’d put wire mesh over them.