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Share of polluted surface water in China 2013-2017, by region

Percentage of polluted surface water in China in 2013 and 2017, by region

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Release date

September 2020



Survey time period

2013 and 2017

Supplementary notes

*2014 and 2017 data.
**2015 and 2017 data.

Polluted surface water refers to surface water with a Water Quality Index (WQI) of grade IV or worse.

The water quality index (WQI) or water quality standard (WQS) is a five-level grading system that measures the quality of a water body.

WQI levels:
I and II: Excellent
III: Good
IV: Lightly polluted
V: Moderately polluted
Worse than V: heavily polluted

The source does not provide a release date. The date given is the date of data access.

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