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Table 4.1. Content of main pollutants in atmospheric air from the data of observations of the State Committee for Hydrometeorology.

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

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