Also, your citation of an EPA website is useless. It just links to the EPA’s IAQ site, which isn’t helpful in trying to figure out what you actually were using from the site. I don’t think I’d use WebMD as a source either if you want to appear reputable to the more intelligent people who can spot bullshit. (Not say WebMD doesn’t have valuable info. Kinda like Wikipedia, a lot is useful and valid, but I would never use it as a source.)