{"product_id":"volume-13-the-science-of-airborne-risk-ppe-failure-and-why-exposure-persists-1","title":"Volume 13 - The Science of Airborne Risk, PPE Failure and Why Exposure Persists","description":"\u003cp data-start=\"159\" data-end=\"293\" class=\"PDq2pG_selectionAnchorContainer\"\u003e\u003cstrong data-start=\"159\" data-end=\"293\"\u003eWhy can contaminated environments remain dangerous even after PPE, air filtration and remediation controls have been put in place?\u003c\/strong\u003e\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"295\" data-end=\"565\"\u003eIn \u003cem data-start=\"298\" data-end=\"367\"\u003eThe Science of Airborne Risk, PPE Failure and Why Exposure Persists\u003c\/em\u003e, Jeff Charlton examines the physical and biological mechanisms that allow contamination to remain airborne, move through buildings and continue exposing occupants long after intervention has begun.\u003c\/p\u003e\n\u003cp data-start=\"567\" data-end=\"843\"\u003eThis thirteenth volume of the Building Forensics Legacy Series challenges the assumption that exposure is a single event. Instead, it presents exposure as an ongoing process shaped by dose, time and the behaviour of air within a building.\u003c\/p\u003e\n\u003cp data-start=\"845\" data-end=\"1159\"\u003eThe book explains that air is not empty space. It is a transport system influenced by temperature, pressure, convection, turbulence and particle interaction. Once contamination becomes airborne, it can travel beyond the original source and create a wider exposure environment.\u003c\/p\u003e\n\u003ch3 data-section-id=\"idgcac\" data-start=\"1161\" data-end=\"1183\"\u003eInside this volume\u003c\/h3\u003e\n\u003cul data-start=\"1185\" data-end=\"2130\"\u003e\n\u003cli data-section-id=\"1hxamp\" data-start=\"1185\" data-end=\"1241\"\u003eWhy exposure is a process rather than a single event\u003c\/li\u003e\n\u003cli data-section-id=\"hvptg3\" data-start=\"1242\" data-end=\"1299\"\u003eThe relationship between dose, time and air behaviour\u003c\/li\u003e\n\u003cli data-section-id=\"18iwz4y\" data-start=\"1300\" data-end=\"1350\"\u003eHow particles move through indoor environments\u003c\/li\u003e\n\u003cli data-section-id=\"mb4eze\" data-start=\"1351\" data-end=\"1403\"\u003eWhy particle size determines depth of inhalation\u003c\/li\u003e\n\u003cli data-section-id=\"1uacfbm\" data-start=\"1404\" data-end=\"1463\"\u003eAir stratification and the vertical breathing-zone risk\u003c\/li\u003e\n\u003cli data-section-id=\"8v2fiz\" data-start=\"1464\" data-end=\"1513\"\u003eBrownian motion and persistent fine particles\u003c\/li\u003e\n\u003cli data-section-id=\"1pnur4r\" data-start=\"1514\" data-end=\"1563\"\u003eWhy dead mould can remain biologically active\u003c\/li\u003e\n\u003cli data-section-id=\"16kqc0\" data-start=\"1564\" data-end=\"1607\"\u003eFragmentation as an exposure multiplier\u003c\/li\u003e\n\u003cli data-section-id=\"1sxy2e7\" data-start=\"1608\" data-end=\"1662\"\u003eThe true capture limits of Negative Pressure Units\u003c\/li\u003e\n\u003cli data-section-id=\"1xvfg9g\" data-start=\"1663\" data-end=\"1706\"\u003eCompeting airflows and short-circuiting\u003c\/li\u003e\n\u003cli data-section-id=\"1aphjny\" data-start=\"1707\" data-end=\"1759\"\u003eWhy PPE performance can collapse during real use\u003c\/li\u003e\n\u003cli data-section-id=\"xj2c31\" data-start=\"1760\" data-end=\"1801\"\u003eFace-seal leakage and bypass exposure\u003c\/li\u003e\n\u003cli data-section-id=\"1xdnjm7\" data-start=\"1802\" data-end=\"1857\"\u003eBehavioural compensation caused by false confidence\u003c\/li\u003e\n\u003cli data-section-id=\"7qku8h\" data-start=\"1858\" data-end=\"1917\"\u003eWhy laboratory success may not translate into buildings\u003c\/li\u003e\n\u003cli data-section-id=\"1oxjg32\" data-start=\"1918\" data-end=\"1968\"\u003eMoisture dynamics and persistent contamination\u003c\/li\u003e\n\u003cli data-section-id=\"mn5n75\" data-start=\"1969\" data-end=\"2013\"\u003eWhy visual clearance cannot prove safety\u003c\/li\u003e\n\u003cli data-section-id=\"1qhg750\" data-start=\"2014\" data-end=\"2064\"\u003eWhy occupants may feel worse after remediation\u003c\/li\u003e\n\u003cli data-section-id=\"kr4g3x\" data-start=\"2065\" data-end=\"2130\"\u003eThe role of verification, source control and material removal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2132\" data-end=\"2534\"\u003eA major focus is particle size. Larger particles may settle relatively quickly, while smaller fragments can remain airborne, travel deeper into the lungs and bypass the upper airway’s natural defences. The most biologically active fraction may also be invisible and non-viable, meaning it can be missed by visual inspections and conventional culture-based testing.\u003c\/p\u003e\n\u003cp data-start=\"2536\" data-end=\"2896\"\u003eThe book also explains the importance of air stratification. Indoor particles do not form one uniform cloud; they can remain at different heights depending on temperature, buoyancy and airflow. This creates different exposure zones, particularly in bedrooms where people remain in one breathing position for several hours.\u003c\/p\u003e\n\u003cp data-start=\"2898\" data-end=\"3232\"\u003eNegative Pressure Units are examined in detail. The volume argues that a single unit does not clean an entire room and only provides meaningful capture within a limited area around the inlet. Beyond that zone, particles remain governed by competing pressure pathways, movement and stratification.\u003c\/p\u003e\n\u003cp data-start=\"3234\" data-end=\"3570\"\u003eThe volume also challenges idealised claims about PPE. Laboratory testing assumes correct fit, stable conditions and perfect use, while real-world environments involve movement, moisture, fatigue, touching, talking and damaged seals. Under those conditions, theoretical protection can fall rapidly.\u003c\/p\u003e\n\u003cp data-start=\"3572\" data-end=\"3890\"\u003eThe central conclusion is that the objective is not simply to kill contamination or complete a procedure. The objective is measurable exposure reduction through source control, removal of contaminated materials, effective air management and scientifically defensible verification.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1iwg04a\" data-start=\"3892\" data-end=\"3907\"\u003eWritten for\u003c\/h3\u003e\n\u003cp data-start=\"3909\" data-end=\"4142\"\u003eHousing providers, remediation contractors, environmental health professionals, insurers, safety specialists, clinicians, regulators, legal teams and anyone responsible for managing airborne contamination or building-related illness.\u003c\/p\u003e","brand":"Building Forensics","offers":[{"title":"Default Title","offer_id":58430821171584,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0998\/4956\/8640\/files\/17215577-06c5-4016-b636-12fbe23e473b_59cdd4d3-5447-40e5-832a-59cf9c6234bf.png?v=1783812801","url":"https:\/\/shop.buildingforensics.co.uk\/products\/volume-13-the-science-of-airborne-risk-ppe-failure-and-why-exposure-persists-1","provider":"Building Forensics","version":"1.0","type":"link"}