Table
River Quality Changes as Monitored by Tests during 1974–1991
(in % of river length tested)
(according to the "Report on the State, Endangerment and Protection of the Environment 1990, CSO Warsaw 1990,
"Environmental Protection 1996", CSO Warsaw 1996)
Year Criterion
(tested characteristics)		 Length
of Control Sections
(1000 km)		 Cleanliness
Class I		 Cleanliness
Class II		 Cleanliness
Class III		 Non-Classified
(Overly Polluted)
1974-77 physio-chemical 17.89.6 30.726.7 33.0
1978-83 physio-chemical 16.26.8 27.829.0 36.4
1984-88 physio-chemical
biological		 17.6
16.5		 4.8
0.0		 30.3
3.9		 27.8
20.3		 37.1
75.8
1990 physio-chemical
biological		 10.1
10.1		 6.0
0.0		 27.9
3.0		 30.3
16.8		 35.8
80.2
1995 physio-chemical
biological
general*		 6.2
6.2
6.2		 2.9
0.0
0		 20.3
3.1
1.2		 33.8
11.8
11.5		 43.0
85.1
87.3

* physico-chemical together with biological

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