Maintaining air quality within building spaces is a challenge under the increased
pollutants resources. The optimization of the courtyard building layout toward natural ventilation
has emerged as a critical factor in shaping air quality conditions. This study delves into the
assessment of outdoor air quality infiltration within a dual courtyard typology characterized by
varying proportions and orientations for both the connecting link and openings. To
comprehensively analyse air quality within these integrated courtyards, a combination of on-site
particle dispersion measurements and flow pattern simulations were employed. The outcomes of
this investigation highlight the pronounced impact of atmospheric conditions, particularly wind
direction, on the performance of courtyard configurations. The results revealed that dual
courtyard provide an approach to address the geometric conflict between thermal comfort and
air quality optimization. Even in circumstances with limited flow velocity, the direct connection
between courtyards deepens the upward recirculating flow into the courtyard cavity at the activity
level. The optimal air quality is attained by planning each courtyard's upper-level intake and
outflow openings, as it provides an evacuation flow out of court cavity and decline the PNC than
outside surrounding conditions.