Hoping to breathe in some clean air? You see a cinder block building. That looks clean. You don't think anything could float in the air off of the cinder blocks. Think again. They added fiberglass between the concrete blocks and the wood frame on the inside. A perfect breeding ground for mold on top of the microscopic glass particles that shatter and exit out of the light and outlet sockets with the negative pressure inside the building.
Moldy fiberglass behind a cinder block wall inside of a building.
Fiberglass behind a cinder block wall.
Fiberglass batts behind a cinder block wall being removed after it was discovered that they were causing the air inside the building to be very poor which was making people sick.