LEVELS of a potentially harmful gas emitted by the Withyhedge Landfill Site have been recorded above World Health Organization (WHO) guideline levels, according to a recent report. Public Health Wales (PHW) conducted a health risk assessment on air quality data collected between 1 March and 3 April 2024 in the surrounding area.

The data indicates that during March and April, hydrogen sulphide, a colourless gas with a distinctive “eggy” smell, exceeded the WHO’s odour annoyance guideline. PHW warns that exposure to such odours can cause symptoms like headaches, nausea, dizziness, watery eyes, stuffy nose, irritated throat, cough or wheeze, sleep disturbances, and stress.

PHW stresses the importance of addressing the source of these offsite odours to mitigate potential health impacts on the local community. Despite an enforcement deadline passing last month, residents continue to report gas and odour issues in their homes daily.

“These are common reactions to unpleasant smells, and these effects should usually pass once the odour has dissipated,” PHW stated. “The long-term health risk is low.”

In response to the health risk assessment, PHW advises residents to keep doors and windows closed when the odours are present and seek medical advice if they feel unwell. However, they caution against blocking windows or vents completely, as these are crucial for ventilation and controlling dampness. Once the outdoor smell subsides, opening windows and doors can help eliminate any remaining odours inside.

Work to cap the landfill site has been completed, and PHW has welcomed plans to install static air monitoring equipment around the site to capture more detailed data. Dr. Sarah Jones, a consultant in environmental public health for PHW, acknowledged the stress and anxiety local residents are experiencing due to the odours. She emphasised the importance of resolving the issue swiftly and assured that the health risk assessment would be updated as new data becomes available.

Gaynor Toft, Chair of the Air Quality Group for the Multi-Agency Incident Management team, noted that the risk assessment from PHW is being used to refine and develop the air quality monitoring programme. Suitable locations for static monitoring equipment are being identified to ensure robust data collection for future assessments.

Huwel Manley of Natural Resources Wales (NRW) confirmed that NRW would continue to use its regulatory powers to drive improvements at the site and address the causes of the odour affecting the community. NRW had given RML, the company operating the landfill, until mid-May to undertake several remedial actions to control gas emissions.

The Pembrokeshire Herald has reached out to NRW for a detailed update on the current situation at the site. The community remains hopeful for a swift resolution to these ongoing health and environmental concerns.