Bangkok Implements Systematic Urban Heat Management Program to Address Root Causes
Bangkok has identified 379 heat risk zones and launched a systematic program combining real-time heat alerts and long-term urban planning reforms to protect residents during increasingly intense hot seasons fueled by climate change.
Bangkok enters its hot season from February through May each year, with climate change intensifying weather conditions and particularly exacerbating the urban heat island effect, which impacts public health, daily life, and livelihoods. The Bangkok Metropolitan Administration is implementing a comprehensive heat management strategy for both short and long-term solutions under the oversight of a dedicated heat management committee to protect residents' quality of life. The city has identified 379 heat risk zones across Bangkok, mostly in open areas with high population density and shared public spaces such as construction sites, motorcycle taxi stands, parks, outdoor sports facilities, markets, and densely populated communities.
Short-term measures include monitoring and early warning systems. Bangkok closely tracks heat conditions using the Heat Index, which reflects the temperature the human body actually perceives based on the relationship between temperature and relative humidity. When humidity is high, the body cannot cool itself effectively through sweating, making conditions feel hotter than they are and increasing health risks. The alert system uses four color-coded levels:
Green (Caution): Heat Index 27.0–32.9°C – Monitor information and maintain general health practices Yellow (Warning): Heat Index 33.0–41.9°C – Reduce outdoor activity duration Orange (Dangerous): Heat Index 42.0–51.9°C – Avoid outdoor activities; implement intensive protective measures if necessary Red (Extremely Dangerous): Heat Index above 52.0°C – Completely halt outdoor activities due to high risk of heat stroke
Alerts are disseminated through the AirBKK application, the Greener Bangkok website, the Bangkok PR website, Facebook, the Bangkok Air Quality Information Center, and smart traffic signs.
Long-term measures address root causes through urban restructuring and legal reforms to reduce future heat accumulation. These include integrating heat adaptation with urban planning; implementing mandatory permeable surface requirements for new buildings since 2013 to reduce urban heat islands; using FAR bonus incentives to promote green buildings and water retention areas; increasing green space and open areas in each land-use zone; promoting compact urban development with shade, pedestrian pathways, and climate-appropriate public transportation; creating green corridors through streets and canals via a comprehensive Bangkok master plan; developing heat-risk maps incorporating health vulnerability data; linking urban planning requirements with building control regulations to support climate-responsive design; and developing low-cost, no-regret cooling infrastructure such as reflective roofing systems.
