Exposure to asbestos causes cancers and other diseases, including mesothelioma and asbestosis. No amount of asbestos exposure is safe, but asbestos generally has the worst effects when a person is exposed to an intense concentration of it, or they are exposed on a regular basis over a long period of time.

Asbestos can remain in-place as long as it's not disturbed and gets examined annually by a trained and professional environmental company.  Biggs and Narciso recommends to remove any asbestos-containing materials for a better peace of mind.

Moulds are a type of fungus that are found almost anywhere – both outdoors and indoors. Indoor moulds usually originate from outside organic sources such as soil and vegetation. As  part of their reproductive cycle, moulds produce millions of microscopic particles called spores. Moulds spread by releasing these spores into the air. The presence of moisture is essential for moulds to grow and they are therefore usually found in damp, poorly ventilated areas.

Exposure to toxic moulds may irritate skin, eyes, nose, and throat, resulting in allergy-like symptoms such as difficulty in breathing, runny nose, and watery eyes. Other symptoms could include fatigue and headache. People with allergies to moulds may experience asthma attacks. Exposure to the more dangerous moulds such as Stachybotrys or Chaetomium could result in more serious symptoms including burning in the  nose, nose bleeds, severe coughing, and impairment of the immune system. Excessive exposure can worsen conditions like asthma, bronchitis, hay fever or other allergies.

It is imperative that mould be removed completely and the problem that created the mould in the first place be rectified. However, this work requires special control measures to prevent worker exposure as well as eliminate the possibility that the mould will spread to adjacent areas. In the case of Stachybotrys contamination this is particularly important because of its potentially severe health effects.