Fed SO2, CO, NO2
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资源简介：
Designation areas are defined pursuant to the corresponding federal national ambient air quality standard for each pollutant as per the Clean Air Act. The federal NO2, SO2, CO designations layer is a polygon coverage providing area designations as per 40CFR81.305. There are three designation categories: nonattainment, unclassifiable and attainment areas.
创建时间：
2021-09-10
