Environmental Justice Areas - EJ Designated Census Block Groups 2015

This layer identifies 2015 Pennsylvania Census Block Groups which meet the PADEP definition for Environmental Justice Areas by having a poverty rate of 20% or greater or a non-white population of 30% or greater. Percentages were rounded up based on a decimal value of .5 or greater for purposes of creating this layer. Per the US Census Bureau, Block Groups (BGs) are statistical divisions of census tracts, are generally defined to contain between 600 and 3,000 people, and are used to present data and control block numbering. A BG usually covers a contiguous area. Each census tract contains at least one BG, and BGs are uniquely numbered within the census tract. Within the standard census geographic hierarchy, BGs never cross state, county, or census tract boundaries but may cross the boundaries of any other geographic entity.本图层筛选出符合宾夕法尼亚州环境保护部（Pennsylvania Department of Environmental Protection，PADEP）环境正义区域定义的2015年宾夕法尼亚州人口普查街区组（Census Block Groups），筛选条件为贫困率不低于20%，或非白人人口占比不低于30%。为制作本图层，所有占比均按照小数部分≥0.5的规则进行向上取整处理。根据美国人口普查局（US Census Bureau）的规定，街区组（Block Groups，BG）是人口普查片区（census tract）的统计分区，通常设定人口规模在600至3000人之间，用于数据发布与普查街区编号管控。街区组通常覆盖连片区域。每个普查片区至少包含一个街区组，且街区组在所属普查片区内拥有唯一编号。在标准人口普查地理层级体系中，街区组不会跨越州、县或普查片区的边界，但可跨越其他任意地理实体的边界。