Changes in temperature and precipitation, sea level, fisheries, agriculture, natural ecosystems, and air quality will all directly or indirectly affect human morbidity (illness) or mortality. One of the great challenges facing our current generation of scientists and engineers is how to protect urban population from health stressors associated with summertime heat. As heat-waves are likely to increase in frequency because of global climate change, the most effective interventions, measures and policies to protect the health need to be developed and evaluated. Therefore, this paper is focused on understanding the most important factors of urban heat island (UHI) formation and their effects on urban population health with an emphasis on the considerable growth of both population and rapid urbanization of Tehran, Iran. To achieve this aim, this paper explores literally a conceptual framework about the relationship between UHI and human health. Then, it suggests three important strategies to minimize the impact of UHI on human health: achieving appropriate transportation for mitigating air pollution, providing appropriate landscape, increasing the albedo of building materials. Keywords: appropriate landscape, appropriate material, appropriate transportation, human health, natural ventilation, urban heat island.
INTRODUCTION 1Climate change is a global phenomenon that leaves no part of the world untouched. Everywhere, changes in climate are having observable impacts on both natural and human systems -water resources, ecosystems, food and forest products, coastal systems, industry, settlements and societies, and human health, involving significant social, economic and environmental consequences [1].Climate change presents significant challenges in efforts to maintain and improve the health and well-being of people living around the world. Many of the environmental hazards exert a direct or indirect effect on the health and well-being of urban dwellers. One of the most important hazards which impact on health and quality of life is 'urban heat island'. Urban heat island (UHI) can directly affect health because high temperatures place an added stress on human physiology. UHI will have wide-ranging impacts on society and the infrastructure that support civilization. It could impact not only agricultural and human health, but also patterns of human settlement, energy use, transportation, industry, environmental quality, and other aspect of infrastructure that affect our quality of life [2].According to the above perspective it becomes increasingly important to apply heat island mitigation strategies in order to protect human health from health stressors associated with summer time heat.Thus, this paper investigates that which factors cause UHI formation, especially in Tehran metropolitan, and then by recognizing some factors which have more effects on health, suggests some solutions from urban design perspective in order to have healthy environment.