Consideration of the Feasibility of Developing a Simple Methodology to Assess Dispersion in Low/Zero Windspeeds

In general, low wind speeds lead to higher toxic concentrations and larger flammable gas clouds.

However, quantified risk assessments are subject to various uncertainties at low wind speeds relating to the characteristics of low wind speed episodes and also to the applicability of dispersion models.

Following a prelimiary study of these issues, HSE requested that W.S.

Aitken undertake further work to determine the most appropriate way to include dispersion in low wind speeds within quantified risk assessment.