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Radon meaning

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What does Radon mean?
In legal practice, radon refers to a naturally occurring radioactive gas that can accumulate inside buildings and trigger duties in property transactions, construction and workplace health and safety. It is a scientific term rather than a defined legal term; legal obligations arise from legislation and regulator guidance that set reference levels at which action is required. Formed by the decay of uranium, radium and thorium in rocks and soils, radon is a heavy, inert noble gas (Group 18) and is often the largest contributor to background ionising radiation. Levels vary markedly by location; national radon maps (UKHSA in the UK; EPA in Ireland) identify “radon‑affected areas”. Key legal relevance: - Property and environmental due diligence: conveyancers commonly commission radon searches; contracts may allocate survey, mitigation (e.g., sumps, ventilation) and warranty risk. - Building regulations: new builds and certain refurbishments in mapped areas may require radon barriers/ventilation (England & Wales Approved Document C; Scottish Technical Handbooks; Northern Ireland Technical Booklet C; Ireland TGD C). - Workplaces: employers must assess radon risk, especially in basements/ground floors or underground sites; exceedance of national reference levels engages ionising‑radiation control duties and, in the UK, possible notification under the Ionising Radiations Regulations 2017 (IRR17) (HSENI in NI;...
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PRACTICE NOTES
Environmental risk assessment for lawyers: principles, qualitative and quantitative methods, hazard identification, site investigations, risk estimation and evaluation, and the Environment Agency’s LCRM for contaminated land

What is environmental risk assessment? Environmental risk assessment (ERA) is applied to many environmental concerns, including contaminated land, flood risks, asbestos, radon and subsidence. The specific study undertaken is selected once the hazard has been recognised and the assessment's aims and objectives are set. The scope and detail of an ERA differ according to the various environmental factors considered. Nonetheless, every assessment adheres to a core approach for quantifying risk. Calculation of risk Defra guidance on environmental risk assessment and management defines risk as the potential consequence(s) of a hazard together with the likelihood/probability of those outcomes...

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PRACTICE NOTES
Acting for sellers in property transactions: environmental liabilities, permit transfers, contaminated land and climate risk (England and Wales)

Types of environmental liabilities Environmental liabilities arise in relation to land, buildings and fixtures. Under caveat emptor/buyer beware, such liabilities and any capital expenditure needs will generally pass to the buyer as the new owner. Whether the seller remains on the hook depends on the applicable regime and whether the deal is an asset or share sale. For instance, in an asset sale, non-compliance with an environmental permit, or causing or knowingly permitting pollution, can still attach to the seller company or individuals after completion. The principal types are outlined below. Land Contamination, asbestos in soil, water pollution, environmental damage, landfills, fly-tipped waste, flooding, ground subsidence, sinkholes, coal mining, unexploded ordnance, radon, Japanese knotweed, wildlife and habitat protection, riparian ownership, shale gas, energy projects, planning conditions, high speed 2, cross rail, compulsory purchase Buildings Asbestos in buildings, air conditioning inspections, energy management and reporting, energy performance certificates, minimum energy efficiency standards, display energy certificates, energy savings opportunity scheme, F-gases...

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