Biological Hazard
Biological Hazard
Cross-Contamination
Last Updated: 3 February 2025Cross-contamination in the context of mould refers to the spread of mould spores (and potentially mycotoxins) from an affected area to otherwise clean or unaffected parts of a building. This often occurs when contaminated materials are moved or disturbed without proper containment measures, causing spores to become airborne and settle on new surfaces. In remediation...
Mycology
Last Updated: 3 February 2025Mycology is the scientific study of fungi, encompassing everything from common moulds to mushrooms and yeasts. This field explores the taxonomy, genetics, ecology, and biochemistry of fungal species, providing crucial insights into how they grow, reproduce, and interact with their environments. In an occupational health and safety context, mycology underpins our understanding of mould: it...
Bioaerosol Sampling
Last Updated: 3 February 2025Bioaerosol sampling is the process of collecting and analyzing air samples to quantify and identify airborne biological particles, such as mould spores, bacteria, or viruses. In the context of mould, this method helps occupational hygienists determine if spore counts exceed normal background levels and whether certain toxigenic species are present. Various sampling techniques exist, including...
Toxic Mould
Last Updated: 3 February 2025“Toxic mould” is a non-scientific term commonly used to describe mould species that produce harmful mycotoxins, potentially posing serious health threats. While many moulds can cause allergic reactions or respiratory issues, toxic moulds—like some strains of Stachybotrys, Aspergillus, and Fusarium—are often cited for their higher risk of causing more severe or systemic symptoms. It’s important...
PPE (Personal Protective Equipment)
Last Updated: 3 February 2025Personal Protective Equipment (PPE) is the last line of defence in the hierarchy of controls, used when hazards cannot be completely eliminated or reduced through engineering or administrative measures. In mould-related work, PPE can be essential to protect individuals from inhaling spores or coming into contact with mycotoxins. Typical PPE for mould remediation includes respirators...
Indoor Air Quality (IAQ)
Last Updated: 3 February 2025Indoor Air Quality (IAQ) is a measure of the cleanliness and safety of the air inside buildings, influenced by various factors such as pollutants, ventilation effectiveness, temperature, and humidity. In workplaces, maintaining good IAQ is essential for occupant comfort, productivity, and health. Mould growth is one of the most common IAQ concerns, as mould spores...
Health Monitoring
Last Updated: 3 February 2025Health monitoring in the context of mould exposure involves assessing the well-being of workers who may be at risk of adverse effects from biological hazards. Under certain regulations—such as Part 4.2 of the OHS Regulations 2017 in Victoria—employers are required to offer medical checks when workers are routinely or significantly exposed to hazards like mould....
Occupational Hygienist
Last Updated: 3 February 2025An occupational hygienist is a professional who specializes in anticipating, recognizing, evaluating, and controlling health hazards in the workplace. Their expertise extends to chemical, physical, and biological hazards, including mould. When mould issues arise, an occupational hygienist can conduct comprehensive assessments to identify the source, type, and extent of contamination. This often involves air sampling,...
Ventilation Controls
Last Updated: 3 February 2025Ventilation controls encompass a range of strategies designed to regulate airflow, temperature, and humidity within a building—factors directly impacting mould growth and indoor air quality. Proper ventilation dilutes and removes airborne contaminants, including mould spores, bacteria, and volatile organic compounds. In many workplace environments, mechanical HVAC systems (Heating, Ventilation, and Air Conditioning) play a pivotal...
Containment
Last Updated: 3 February 2025Containment refers to the methods used to isolate a mould-affected area during remediation, preventing spores from dispersing to unaffected parts of the building. This is particularly critical in large-scale or toxic mould infestations, where high spore counts and mycotoxins present a health risk not only to the remediation team but also to other occupants. Common...
Remediation
Last Updated: 3 February 2025Remediation is the process by which mould-affected materials are either cleaned or removed to restore a safe and healthy environment. In practice, this can range from small-scale cleaning efforts—such as wiping down a minor mould colony with detergent and water—to large-scale operations requiring professional remediation teams equipped with specialized tools and protective gear. The extent...
Dampness / Moisture Intrusion
Last Updated: 3 February 2025Dampness, or moisture intrusion, refers to the presence of unwanted water or excessive humidity within a building. Common sources include leaking pipes, roof leaks, flooding, condensation, or high indoor humidity. When moisture accumulates in materials like drywall, carpets, or wooden structures, mould can begin to grow in as little as 24–48 hours. Therefore, dampness is...
MVOCs (Microbial Volatile Organic Compounds)
Last Updated: 3 February 2025MVOCs, or Microbial Volatile Organic Compounds, are gaseous substances produced by actively growing mould and other microorganisms. These compounds often impart a distinctive musty, earthy, or sometimes pungent odor, which can serve as an early warning sign of hidden mould growth in a building. While the mere presence of a musty smell does not confirm...
Bioaerosols
Last Updated: 3 February 2025Bioaerosols are airborne particles of biological origin, which can include mould spores, bacterial cells, viruses, and pollen, among others. In indoor environments, mould spores are often a primary concern, especially in settings with inadequate ventilation or ongoing moisture problems. The term “bioaerosol” emphasizes that these particles originate from living organisms or biological processes, and they...
Allergen
Last Updated: 3 February 2025In the context of mould, an allergen is any substance—particularly mould spores—that can trigger an immune response in certain individuals, known as an allergic reaction. Allergic reactions vary widely in severity, from mild symptoms such as a runny nose, itchy eyes, or sneezing, to more intense responses like wheezing, shortness of breath, or even full-blown...
Stachybotrys chartarum (“Black Mould”)
Last Updated: 3 February 2025Stachybotrys chartarum is one of the most well-known—and often feared—types of indoor mould, commonly referred to as “black mould” due to its dark greenish-black appearance. It typically grows on water-damaged cellulose-based materials such as paper, drywall, carpet backing, or ceiling tiles. This mould thrives in persistently damp or humid conditions; once established, it can be...
Mycotoxins
Last Updated: 3 February 2025Mycotoxins are naturally occurring toxic compounds produced by certain types of mould, such as Stachybotrys chartarum (often referred to as “black mould”) and some Aspergillus species. These substances are not living organisms themselves but rather chemical byproducts formed under specific environmental conditions, typically when mould colonies encounter nutrients and moisture over extended periods. Mycotoxins can...
Spores
Last Updated: 3 February 2025Spores are tiny, often microscopic, reproductive units released by fungi—including mould. They are analogous to seeds in the plant world, allowing the fungus to propagate and colonize new environments. Because they are very lightweight, spores can remain suspended in the air and travel significant distances on air currents. This airborne characteristic makes them a key...
Mould (Fungus)
Last Updated: 3 February 2025Mould is a type of fungus that grows in the form of multicellular filaments known as hyphae, which collectively form a visible colony called a mycelium. Unlike bacteria or viruses, mould thrives in moist or humid environments, feeding on organic materials such as wood, paper, or drywall. This makes buildings with water damage, leaks, or...
Biological Hazard
Last Updated: 3 February 2025A biological hazard (often referred to as a biohazard) is any biological substance—whether a living organism or a byproduct of an organism—that can potentially threaten human health. This broad category includes bacteria, viruses, fungi (such as mould), and parasites. In occupational settings, biological hazards arise in various ways: from contaminated surfaces, through the air (as...