Environmental Health Hazard Index

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ENVIRONMENTAL HEALTH HAZARD INDEXSummary The environmental health hazard exposure index summarizes potential exposure to harmful toxins at a neighborhood level. Potential health hazards exposure is a linear combination of standardized EPA estimates of air quality carcinogenic (c), respiratory (r) and neurological (n) hazards with i indexing census tracts.<img alt='formula' src='https://hud.maps.arcgis.com/sharing/rest/content/items/65dc28c031704cc9b795fe7afa54ce4f/data' /> Where means <img alt='means' src='https://hud.maps.arcgis.com/sharing/rest/content/items/c0c32c8d931c47a4b4c26791f638a3ff/data' style='font-size:medium;' /> and standard errors <img alt='EHHI_Errors' src='https://hud.maps.arcgis.com/sharing/rest/content/items/d0cf6927a352437ca698d98cc945cc80/data' style='font-size:medium;' /> are estimated over the national distribution. Interpretation Values are inverted and then percentile ranked nationally. Values range from 0 to 100. The higher the index value, the less exposure to toxins harmful to human health. Therefore, the higher the value, the better the environmental quality of a neighborhood, where a neighborhood is a census block-group. Data Source: National Air Toxics Assessment (NATA) data, 2014. Related AFFH-T Local Government, PHA and State Tables/Maps: Table 12; Map 13. References: <a href='https://www.epa.gov/ttn/atw/natamain/' rel='nofollow ugc'>https://www.epa.gov/ttn/atw/natamain/</a> To learn more about the Environmental Health Hazard Index visit: <a href='https://www.hud.gov/program_offices/fair_housing_equal_opp/affh' style='color:rgb(0, 97, 155); text-decoration-line:none; font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;' target='_blank' rel='nofollow ugc noopener noreferrer'>https://www.hud.gov/program_offices/fair_housing_equal_opp/affh</a> ; <a href='https://www.hud.gov/sites/dfiles/FHEO/documents/AFFH-T-Data-Documentation-AFFHT0006-July-2020.pdf' style='color:rgb(0, 94, 149); font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;' target='_blank' rel='nofollow ugc noopener noreferrer'>https://www.hud.gov/sites/dfiles/FHEO/documents/AFFH-T-Data-Documentation-AFFHT0006-July-2020.pdf</a>, for questions about the spatial attribution of this dataset, please reach out to us at <a href='mailto:GISHelpdesk@hud.gov' style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;' target='_blank' rel='nofollow ugc noopener noreferrer'>GISHelpdesk@hud.gov</a>. Date of Coverage: 07/2020

环境健康危害指数（Environmental Health Hazard Index） **摘要** 环境健康危害暴露指数用于汇总社区层面的有害毒素潜在暴露情况。潜在健康危害暴露为标准化美国环境保护署（U.S. Environmental Protection Agency，简称EPA）估算的空气质量致癌危害（记为$c$）、呼吸道危害（记为$r$）以及神经危害（记为$n$）的线性组合，其中$i$以人口普查片区为索引单位。【居中对齐】计算公式如下：[对应公式图片] 其中，$ar{x}$（对应均值图片）代表均值，标准误差（对应EHHI_Errors图片）则基于全国分布完成估算。 **结果解读** 指数数值先经反转处理，随后在全国范围内进行百分位排名，取值区间为0至100。指数数值越高，代表人体接触有害健康毒素的暴露程度越低，即对应社区的环境质量越好。本数据集的统计单元为人口普查街区组。 **数据来源**：2014年全国空气毒素评估（National Air Toxics Assessment, NATA）数据。相关AFFH-T地方政府、公共住房机构（Public Housing Agency，简称PHA）及州级表格/地图：表格12；地图13。 **参考文献**：https://www.epa.gov/ttn/atw/natamain/ 如需了解更多关于环境健康危害指数的相关信息，请访问：https://www.hud.gov/program_offices/fair_housing_equal_opp/affh ； https://www.hud.gov/sites/dfiles/FHEO/documents/AFFH-T-Data-Documentation-AFFHT0006-July-2020.pdf。如需咨询本数据集的空间归因相关问题，请发送邮件至 GISHelpdesk@hud.gov。覆盖日期：2020年7月

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