A heat vulnerability index to improve urban public health management in San Juan, Puerto Rico

TitleA heat vulnerability index to improve urban public health management in San Juan, Puerto Rico
Publication TypeJournal Article
Year of Publication2016
AuthorsMéndez-Lázaro P, Muller-Karger FE, Otis DB, McCarthy MJ, Rodríguez E
Abstract

Increased frequency and length of high heat epi- sodes are leading to more cardiovascular issues and asthmatic responses among the population of San Juan, the capital of the island of Puerto Rico, USA. An urban heat island effect, which leads to foci of higher temperatures in some urban areas, can raise heat-related mortality. The objective of this research is to map the risk of high temperature in particular locations by creating heat maps of the city of San Juan. The heat vulnera- bility index (HVI) maps were developed using images collect- ed by satellite-based remote sensing combined with census data. Land surface temperature was assessed using images from the Thermal Infrared Sensor flown on Landsat 8. Social deter- minants (e.g., age, unemployment, education and social isola- tion, and health insurance coverage) were analyzed by census tract. The data were examined in the context of land cover maps generated using products from the Puerto Rico Terrestrial Gap Analysis Project (USDA Forest Service). All variables were set in order to transform the indicators expressed in different units into indices between 0 and 1, and the HVI was calculated as sum of score. The tract with highest index was considered to be the most vulnerable and the lowest to be the least vulnerable. Five vulnerability classes were mapped (very high, high, mod- erate, low, and very low). The hottest and the most vulnerable tracts corresponded to highly built areas, including the Luis Munoz International Airport, seaports, parking lots, and high- density residential areas. Several variables contributed to in- creased vulnerability, including higher rates of the population living alone, disabilities, advanced age, and lack of health in- surance coverage. Coolest areas corresponded to vegetated landscapes and urban water bodies. The urban HVI map will be useful to health officers, emergency preparedness personnel, the National Weather Service, and San Juan residents, as it helps to prepare for and to mitigate the potential effects of heat-related illnesses.

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