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    【题目】污染指数指的是综合表示进料中悬浮物和胶体物质的浓度和过滤特性，表征进料对微孔滤膜堵塞程度的一个指标。按照国家统一规定，空气质量达到优良标准即达到国家质量二级标准是指空气污染指数小于等于100。空气污染指数大于50且小于等于100时，说明空气质量为良好。如果空气污染指数小于等于50，说明空气质量为优。

    下面关于空气污染指数的叙述中错误的是

    A. 污染指数大，空气清新，对人体健康有利

    B. 污染指数大，空气污浊，对人体健康有害

    C. 污染指数越小，空气质量状况越优

    D. 污染指数越大，空气污染越严重

    【答案】A

    【解析】

    按照国家统一规定，污染指数越小，空气质量状况越优；污染指数越大，空气污染越严重。所以A的说法是错误的，故A符合题意。

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