What Are The Types Of Ground Gases?
Ground gas usually refers to carbon dioxide and methane. Both of these gases are produced through micro-organisms breaking down organic material. Landfill sites are often the cause of methane and carbon dioxide, but they can occur through backfill, wetlands or soils with a high organic content, inert fills and soil gas. Ground gases can also occur naturally through coal bearing strata, bedrock containing uranium, limestone and organic sediments.
There are many different types of ground gases beyond methane and carbon dioxide. These include:
Radon is a radioactive gas, we can’t see, smell or taste. Guidance on protective measures for new buildings. (RADON) BRE 211:2015
One of two most common ground gases found in the UK typically found near landfill sites, but can occur from other sources.
Commonly associated with both natural and anthropogenic gas sources. CO can be odorous, toxic, asphyxiating, flammable and explosive.
Often found near landfill sites, protection against methane needs to follow BS 8485:2015+A1:2019 codes of practice.
H2S is a very toxic, flammable gas. It is pungent (rotten egg odour) and irritates the eyes, nose and throat.
Volatile Organic Compounds (VOC)
Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. Assessment and management of risks associated with Volatile Organic Compounds (VOCs) is required.