







An indoor air quality assessment was conducted by our specialists at a Kent based treatment works to investigate concerns about yellowing walls in a central corridor. The study aimed to identify potential air quality issues and determine the root causes of discoloration.
The findings revealed that the indoor air quality was generally good in terms of chemical and biological contaminants. Levels of formaldehyde, volatile organic compounds (VOCs), and carbon monoxide were all well within safe limits. Similarly, airborne dust and microbiological contaminants were negligible and did not pose a risk to occupants.
However, humidity levels in the affected corridor were significantly high, which was identified as a primary factor contributing to the yellowing of walls and ceiling tiles. Elevated moisture levels can trigger chemical reactions in paint and substrates leading to discoloration. Factors like continuous water flow and standing water in nearby areas exacerbated the issue.
The assessment recommended improving ventilation in the corridor and addressing moisture sources. Using high-moisture-resistant paints and ceiling tiles was also advised to minimise future issues.
This project highlights the importance of maintaining proper humidity levels and ventilation to ensure a safe and visually appealing indoor environment, especially in areas with consistent moisture exposure.