°Air pollution
	Emission of air pollutants in thousand tonnes
	Sulphur dioxide	Oxides of nitrogen (Nox)	Non-methane volatile organic compound (NMVOC)	Particulate matter	Carbon monoxide
1900	28	16.4	16.5		285
1910	34.7	20.4	19.6		280
1920	28.8	19.6	22.6		253
1930	39.6	25.4	38.1		388
1940	35.6	22.9	45		384
1950	46.2	32.9	66.7	21.3	485
1955	64.7	49.3	105	24.6	627
1960	83.1	65.6	143	27.9	770
1965	114	102	206	31.6	1040
1970	106	135	281	35.2	1260
1975	102	147	275	34.1	1360
1980	116	172	316	33	1250
1985	75.6	180	317	30	954
1990	42.6	163	282	26.7	668
1995	27.6	128	188	23.7	490
2000	18.4	113	137	21.1	420
2005	17.9	91.6	102	19.9	339
	Principal emitters of air pollutants in percent
	Sulphur dioxide (SO2)		Oxides of nitrogen (Nox)		Non-methane volatile organic compound (NMVOC)		Carbon monoxide (CO)
	Industry	Transport	Industry	Transport	Industry	Transport	Industry	Transport
1950	53.46	8.14	44.73	34.82	51.65	23.75	24.33	25.57
1955	55.37	7.20	41.04	41.27	51.55	28.55	19.74	34.83
1960	62.94	6.03	35.78	50	46.76	37.10	15.86	47.34
1965	65	5.32	33.07	55.25	44.88	42.06	13.93	58.41
1970	65.57	5.26	28.88	60.22	47.02	42.11	11.02	70.31
1975	68.73	5.52	24.55	65.03	43.06	45.91	8.54	78.83
1980	66.47	5.94	22.12	67.65	48.30	41.18	8.59	78.13
1985	62.19	6.22	20.50	68.72	50.31	39.20	9.18	75.76
1990	67.29	9.06	23.13	64.46	57.53	30.86	10.41	72.14
1995	65.01	6.27	25.00	60.51	59.72	23.89	12.61	62.55
2000	64	12	22	60	58	23	14	64
2005	65	3	23	55	54	19	15	60