Currently, pollutants are measured at different stations in a city and that data is aggregated to a single number (the air quality index) and published once a day on a website.

目前，污染物测量是在一个城市的多个不同地点进行测量的，然后数据会合计成一个数字(空气质量指数)最后在网站上每天发布一次。

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If the search is for the term "blue widgets," then we evaluate the number and quality of relevant links that each page in the index has pointing to it.

如果搜索“蓝色控件”这个短语，那么我们就要开始评估指向这个页面的相关链接数量和质量。

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The research of the composite index number (PI) of soil quality in different soil locations suggests that, the soil quality index increases as the altitude of mountain slope location decreases.

山体坡面不同坡位下土壤质量综合指数(P i)研究表明土壤质量指数随山体坡面位置相对海拔高度的降低而增高。

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