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The image consists of a line graph titled "River Water Quality in the UK," depicting the percentage of river water with good chemical quality from 1990 to 2002 across four regions: Wales, Northern Ireland, England, and Scotland. In 1990, Wales had 75%, Northern Ireland had 45%, England had 70%, and Scotland had 80%; in 1992, Wales had 75%, Northern Ireland had 45%, England had 65%, and Scotland had 85%; in 1994, Wales had 85%, Northern Ireland had 45%, England had 75%, and Scotland had 90%; in 1996, Wales had 85%, Northern Ireland had 65%, England had 85%, and Scotland had 85%; in 1998, Wales had 90%, Northern Ireland had 45%, England had 85%, and Scotland had 85%; in 2000, Wales had 95%, Northern Ireland had 55%, England had 85%, and Scotland had 85%; in 2002, Wales had 95%, Northern Ireland had 65%, England had 90%, and Scotland had 80%.
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The diagram illustrates the changes in the percentage of 4 different regions in the United Kingdom’s good chemical quality river water in/over the period from 1990 to 2002.
Overall, it can be seen that there are two noticeable trends: Wales and Northern Ireland lead in the index of water quality changes, whereas England and Scotland significantly fluctuate at lower figures.
In 1990, the percentages of river water samples with good chemical quality in Wales and Northern Ireland took up around 95% and 85%, respectively. Over the next 8 years, Wales witnessed a decrease of nearly 10%, while Northern Ireland represented the opposite trend.
The proportion of high-quality river water in England, which took more than 40% in 1990, saw an improvement to peak at nearly 70% in 1996 before sharply declining to 30% in 1998. Similarly, Scotland saw an unstable water index, with the first data contributed to above 20% in 1990, maintaining the quality at 30% from a 4-year period until 1996, followed by a rapid increase to 50% in 2000, which was higher than the same year data in England.
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