US EPA Nonattainment Areas and Designations-PM10 (1987 NAAQS)

This web service contains the following layer: PM10 Nonattainment Areas (1987 NAAQS). Full FGDC metadata records for each layer may be found by clicking the layer...本网络服务包含以下图层：可吸入颗粒物（PM10）未达标区域（1987年国家环境空气质量标准（National Ambient Air Quality Standards, NAAQS））。各图层的完整联邦地理数据委员会（FGDC）元数据记录，可通过点击对应图层获取。