Intercity buses operating within designated routes from one part of a city to another frequently stop at several bus stops along the route. These bus stop buildings facilitate passengers embarking and disembarking from buses and provide a place to wait for the next connection. They shelter waiting passengers from inclement weather, offering a comfortable and safe environment. This research explores the provision of a passively cooled interior for a bus stop building in Islamabad, employing Cool Towers and Green Roofs as architectural elements. Cool Towers, fitted with cellulose pads and utilizing evaporative cooling downdrafts, work with gravity for air circulation without electric fans. The system requires minimal electricity, generated by photovoltaic cells, to power a small water pump. Green roofs, engineered ecosystems, further reduce indoor cooling and heating for thermal comfort. Preliminary calculations indicate that the cooling provided by Cool Towers and Green Roofs maintains human comfort during Islamabad's hot and dry months, with acceptable comfort ranges even during the humid months of July and August. The objective is to develop a prototype bus stop building adaptable to various locations in Islamabad and feasible for other regions with similar climates.

Keywords: urbanization, urban heat island, public spaces, passive cooling systems, cool towers, green roofs, thermal comfort, indoor air quality, hot and dry climate.