Content of main pollutants in atmospheric air from the data of observations of the State Committee for Hydrometeorology

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Substance	Number of cities included&n bsp; to generalization	Annual average concentratio n mg/m³	Max. concentration mg/m³	Share of cities % where annual average concent-rations exceeded:			Share of cities % where max imum single concentrations exceeded
Substance	Number of cities included&n bsp; to generalization	Annual average concentratio n mg/m³	Max. concentration mg/m³	1 MPC	5 MPC	10 MPC	1 MPC	5 MPC	10 MPC
Dust	54	0.15	6.1	44	0	0	63	6	2
Sulphur dioxide	52	0.021	0.656	6	0	0	4	0	0
Carbon monoxide	48	2.1	32.0	17	0	0	69	4,2	0
Nitrogen dioxide	52	0.05	0.94	60	0	0	85	11	2
Nitrogen oxide	27	0.03	0.57	7	0	0	7	0	0
Ammonia	23	0.035	0.82	26	0	0	56	0	0
Hydrogen sulphide	17	0.003	0.066	MPC daily average was not found			76	12	0
Phenol	26	0.0038	0.050	46	0	0	77	0	0
Hydrogen fluoride	16	0.0046	0.097	37	0	0	44	0	0
Formal-dehide	23	0.0066	0.153	70	9	0	44	4	0
Hydrogen chloride	10	0.045	0.87	0	0	0	50	0	0
Benzapyren (ng/m³)	48	1.8	23.6*	60	0	0	MPC maximum single was not found

*– maximum from month average concentrations