Cities are experiencing extreme temperature increases at twice the global average rate due to the climate change exacerbated by the Urban Heat Island Effect (UHIE). Over 800 million urban residents globally are at high risk of adverse health effects, some of losing their lives due to a lack of access to sustainable solutions to keep buildings and neighbourhoods cool and adequate for living. Ensuring cool indoor and outdoor environment is therefore indispensable to healthy urban life. However, high and increasing energy consumption for space cooling leads to higher GHG emissions. To address this, passive cooling – a practice of using non-mechanical technology, design elements, and nature-based solutions to keep buildings and cities cool without using energy – is a fundamental solution.