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Strategies to Reduce Urban Heat Islands

Strategies to Reduce Urban Heat Islands. Outline. Heat island definition, causes, and impacts Key strategies to reduce heat islands EPA’s Heat Island Reduction Initiative (HIRI) Program. UHI Definition, Causes, Impact. Urban heat islands Warmer city compared to surrounding

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Strategies to Reduce Urban Heat Islands

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  1. Strategies to Reduce Urban Heat Islands

  2. Outline • Heat island definition, causes, and impacts • Key strategies to reduce heat islands • EPA’s Heat Island Reduction Initiative (HIRI) Program

  3. UHI Definition, Causes, Impact • Urban heat islands • Warmer city compared to surrounding • Mitigation strategies exist. So do barriers to implementation. • Causes • Impact • energy use • air quality • public health

  4. Key Strategies to Reduce UHI • Urban vegetation • Cool roofing • Cool pavements

  5. Key Strategies to Reduce UHI • highly reflective surfaces • roofs and pavement • reflect incoming solar radiation • shade trees • block incoming radiation to keep buildings cooler • naturally cool the surrounding air

  6. Shade Trees & Reflective Surfaces Reduce CO2 Reduce A/C Use Reduce NOx Emissions Reduce VOC Emissions Reduce Air Temperature Reduce Ozone Levels Key Strategies Can Improve Local and Global Environment

  7. Urban Vegetation - Benefits • Energy savings • Air temperature reduction • Air pollution removal • VOC reductions - Shading parking lots • CO2 reduction • Stormwater management • Beautification, property value increases

  8. Cool Roofing - Benefits • Energy savings • Temperature reduction • Reduced air pollution and GHG emissions • Indoor comfort • Durability and waste minimization

  9. Cool Pavements - Benefits • Higher reflectance reduces pavement temperatures • Higher reflectance reduces air temperatures • Theory = cooler pavements last longer and save energy

  10. EPA’s HIRI Program Implementation • Outreach • Website • Conferences • Conference calls • Tools • Heat island reduction strategies guidebook • MIST • Analysis

  11. Heat Island Mitigation: Resources & Contact Info • Resources • EPA’s Heat Island Website: www.epa.gov/heatisland • LBNL Heat Island Group: http://eetd.lbl.gov/heatisland • ICLEI Heat Island Site: www.hotcities.org • Contact • Eva Wong (wong.eva@epa.gov) • Niko Dietsch (dietsch.nikolaas@epa.gov)

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