polluted zone meaning in English

污染带
污染区

According to water pollution levels , the lake was divided into three zones , and these are ( a ) relatively seriously polluted zone , ( b ) clean water resource protection zone and ( c ) less seriously polluted zone . the same result was confirmed by the fuzzy cluster analyse
根据千岛湖污染现状相似性，把千岛湖总体上划分为三大区域，即上游污染较重区、下游清洁水资源保护区和中游中等污染区，同时应用fuzzy聚类分析法对各个取样点污染状况进行聚类分析，结果也验证了上述的分类原则