logical viewpoint that the AHU constitutes the mechanism for mixing and (cross-) transportation of pollutants within the zone. If there is
very good air-mixing, as indicated by a high air exchange e<ectiveness, the single zone approach may be su=cient. However, when there
is large discrepancy in pollutant generation between spaces within the spaces served by the AHU, or when the ventilation is impeded due
to inappropriate partitioning, the zonal characteristics are likely to di<er from space to space.
This paper reports a comparison of the zonal characterisation of an o=ce space whose ventilation and thermal comfort parameters are
di<erent. In this study an integrated approach to IAQ auditing which includes measurements of chemical, biological, particulate, thermal
comfort and ventilation parameters was adopted. Signi>cant di<erences in the values and time pro>les of the various pollutant dimensions
have been observed between the two zones. These di<erences are attributable to the dominant in?uences of interior layout and partitioning,
degree of exposure to the exterior, occupant activities, occupant intervention of the ventilation system by operating the operable windows,
and the materials deployed for interior partitions.
