Year	Type	Western Dvina (10)	Neman (21)	Western Bug (9)	Dnieper (25)	Pripyat (21)	All Belarus
1986	BOD	2.23	2.8	3.34	3.1	3.35	2.96
1987	BOD	2.04	2.47	3.44	2.78	3.33	2.72
1988	BOD	1.84	2.21	2.66	2.73	2.89	2.5
1989	BOD	2.11	2.52	2.79	2.71	3.2	2.65
1990	BOD	2.09	2.89	2.32	2.72	3.3	2.72
1991	BOD	2.15	2.82	2.89	2.8	3.35	2.8
1992	BOD	2.37	2.77	3.28	3.29	3.43	3.05
1993	BOD	2.43	2.74	2.92	3.25	2.9	2.95
1994	BOD	2.62	2.63	3.46	3.22	3	2.99
1995	BOD	2.21	2.76	2.96	3.03	2.93	2.84
1996	BOD	2.44	2.68	3.65	2.99	2.98	2.89
1997	BOD	2.19	2.48	3.14	2.45	2.63	2.49
1998	BOD	2.08	2.39	2.82	2.14	2.27	2.26
1999	BOD	2.03	2.57	2.34	2.55	2.38	2.44
2000	BOD	2.5	2.3	3.31	2.34	2.48	2.44
2001	BOD	2.19	2.38	3.12	2.18	2.49	2.34
2002	BOD	2.01	2.38	2.49	2.63	2.73	2.49
2003	BOD	2.4	2.37	2.38	2.56	3.05	2.57
2004	BOD	2.01	2.48	3.42	2.38	2.66	2.51
2005	BOD	2.2	2.44	3.37	2.48	2.73	2.58
2006	BOD	2.34	2.25	3.12	2.53	2.76	2.56
2007	BOD	1.95	2.2	2.88	2.36	2.45	2.34
2008	BOD	1.93	2.16	2.91	2.33	2.48	2.33
2009	BOD	1.93	2.28	3.12	2.04	2.44	2.28
2010	BOD	2.06	2.23	2.44	2.16	2.5	2.25
2011	BOD	2.07	2.29	2.9	2.09	2.42	2.28
2012	BOD	2.15	2.06	2.83	2.28	2.53	2.32
2013	BOD	2.14	2.05	2.48	2.25	2.46	2.25
2014	BOD	2.06	2.15	2.14	2.22	2.48	2.22
2015	BOD	2.16	2.11	2.12	2.25	2.43	2.23
2016	BOD	2.14	2.12	2.33	2.14	2.58	2.22
2017	BOD	2.13	2.04	2.08	2.25	2.37	2.19
1986	Ammonium	0.01	0.21	0.2	0.8	0.21	0.42
1987	Ammonium	0.01	0.73	0.71	1.32	1.04	0.91
1988	Ammonium	0.07	0.21	0.25	0.68	0.42	0.42
1989	Ammonium	0.02	0.13	0.15	0.53	0.22	0.29
1990	Ammonium	0.37	0.39	0.28	0.52	0.42	0.44
1991	Ammonium	0.83	0.16	0.26	0.43	0.25	0.38
1992	Ammonium	1.44	0.2	0.18	0.57	0.31	0.54
1993	Ammonium	0.92	0.3	0.38	0.79	0.33	0.63
1994	Ammonium	0.95	0.35	0.37	0.57	0.45	0.54
1995	Ammonium	0.44	0.25	0.19	0.38	0.21	0.32
1996	Ammonium	0.68	0.13	0.16	0.47	0.18	0.36
1997	Ammonium	0.38	0.2	0.26	0.3	0.23	0.28
1998	Ammonium	0.3	0.71	0.81	0.93	1.04	0.8
1999	Ammonium	0.46	0.64	0.78	0.97	0.78	0.79
2000	Ammonium	0.5	0.56	0.68	0.77	0.88	0.7
2001	Ammonium	0.51	0.58	0.7	0.76	0.67	0.67
2002	Ammonium	0.44	0.35	0.59	0.85	0.66	0.64
2003	Ammonium	0.64	0.47	0.81	0.96	0.73	0.78
2004	Ammonium	0.39	0.36	0.52	0.6	0.66	0.53
2005	Ammonium	0.45	0.37	0.33	0.74	0.67	0.58
2006	Ammonium	0.49	0.4	0.48	0.79	0.68	0.62
2007	Ammonium	0.34	0.28	0.44	0.66	0.58	0.51
2008	Ammonium	0.41	0.25	0.39	0.58	0.45	0.44
2009	Ammonium	0.41	0.39	0.43	0.53	0.52	0.47
2010	Ammonium	0.42	0.42	0.52	0.6	0.59	0.53
2011	Ammonium	0.42	0.37	0.51	0.46	0.53	0.45
2012	Ammonium	0.3	0.27	0.45	0.38	0.57	0.39
2013	Ammonium	0.26	0.25	0.34	0.41	0.56	0.37
2014	Ammonium	0.28	0.28	0.48	0.41	0.46	0.38
2015	Ammonium	0.22	0.21	0.22	0.37	0.44	0.31
2016	Ammonium	0.2	0.19	0.23	0.35	0.45	0.3
2017	Ammonium	0.16	0.17	0.27	0.35	0.32	0.27