The chart provides information about the percentage of good quality of chemicals in water of UK rivers between 1990 and 2002.
Overall, all countries rivers except Wales the percentage of quality good chemicals rose, figures of Northern Ireland was a bit turbulent.
In 1990 figures prioritized and was unchanged with approximately 97% during a long-term from 1990 to 1998 and from 1998 the figures fell to 93%. In 2002 there were 2 dominants, Scotland and Northern Ireland with 97%. The quality of useful chemicals of Scotland’s rivers in 1990 were 95% and stayed unchanged untill 1996, after this year the figures declined to 93%, then from 1998 started rising to 97% at 2000 after 2 years the figures were unchanged. Throughout 12 years the number of northern Ireland were not unchanged then others. In 1990 the figures started being turbulent untill 1996, from this year the figures started rise gradually and in 2002 prioritized with Scotland. England had the lowest numbers, in 1990 from 83% untill 1992 rose slightly and from 1992 to 1998 the changes were infinitesimal. In 1998 the figures rose to 90% and after the year the figures were unchanged.