the chart below shows the percentage of water in uk rivers that was classified as having good chemical quality between 1990 and 2002

The line chart displays the percentage of water in rivers across four parts of the UK-Wales, Northern Ireland, England, and Scotland

,

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that was rated as having good chemical quality between 1990 and 2002.

Overall

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, Wales and Northern Ireland maintained high percentages,

while

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Scotland and England experienced more fluctuation during the period. Wales had the highest and most stable figures, staying above 90% throughout. Northern Ireland

also

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showed a consistently high quality, rising slightly from around 85% in 1990 to almost 100% in 2002. Regarding

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the

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England,

on the other hand

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,

started

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at about 55%, reached a peak of 70% around 1996, and

then

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dropped again, ending at around 65%. Scotland’s quality was the lowest at the beginning, just above 20%, but it improved significantly and crossed England’s level around 2001, reaching approximately 60% in 2002.