Be sure to warn him about the Boogeyman who lurks in the shadows, as well.
Your "fears" are completely unfounded and are the result of the moron generation being raised in a protected sterile environment. If such dangers actually existed in the severity that you're so paranoid about, please explain how people still around as old as their 80s or 90s and even into the 100s, in some cases. These people never took such precautions because there wasn't such Liberal paranoia scares back in their day - and yet, they survived as long as they have.
Here's my advice - go fishing, handle the weights. Help your friend scrub the black mold. Don't worry about a respirator - as long as you don't put your face down and rub it all over, it won't hurt you in the least.
And stop being afraid of everything. There's a real world out there that you have to experience - and you can't wear protective clothing in a sauna.