Is this a health risk?

If its mold its toxic weather its black, gray or white , and will really be hard on the body , i think id stay away from this stuff until its cleaned up and you should report this!

Any mold is toxic. And bad.
Symptoms are allergic reactions including runny noses, itchy-watery eyes, coughing, sneezing, throat irritation, and exaserbation of asthma.
Non- specific health complaints including headaches, decreased attention span, difficulty concentrating, and dizziness.
Serious or life threatening disease normally affects people with abnormally functioning immune systems or under very extreme conditions, rare cases of respiratory arrest, organic dust toxic syndrome, hypersensitivity pneumonitis have been reported and neurological effects.
Mycotoxicosis poisoning caused by ingestion of a mycotoxin.