I'm wondering if this is mold, moss or algae growing right outside my apartment window.
http://imgur.com/a/JUDK2
I've been having trouble breathing for the past 2 weeks and at first I thought it was indoor mold somewhere. Contractors came to look today an told me there was no mold inside and then told me this was moss. Also I live in a studio apartment and this windows is pretty much my only source of ventilation asides from the bathroom window.
From what I see on the internet moss looks fuzzy. This is not fuzzy at all. This is completely flat and has black around it. I feel like this is where my problem lies but I'm not sure. I also heard algae can be equally as bad as mold to breathe in. Any thoughts?