Abstract: Coastal city is an area that is still strongly influenced by sea breeze. Characteristics of the sea breeze is blowing during the day from the sea to the land every day, it can be utilized to improve the air quality in urban areas. This study aims to assess the physical characteristics of the coastal city to assess the quality of air. This research was conducted in Makassar, in three locations of city regions which were selected as the observation units to be studied, each area have a radius of 100 m. To support this research, the measurements of wind speed and direction had been conducted in those three regions. Measurements of microclimate conditions at all measuring points were simultaneously carried out five times, since morning to evening in the fair-weather. The aspects of physical characteristics of the environment studied; including building mass, environmental density, building materials, land cover material, and landscapes. The analysis was carried out quantitatively using a formula by Edward Ng (2006) as the indicator and statistical analysis. Air quality was mapped using the ENV-Met V.3.1 software. The result of the analysis shows that the physical characteristics of coastal city had a significant effect on the utilization of local wind to improve air quality.