Table 1 Maximum and mean concentration of PM10, PM2.5 and PM1 (μg/m ³ )

Central Station. Pl. 13

163

120

109

40

28

22

Central Station Pl. 3

235

81

75

44

28

22

Dreieich-Offenthal

567

549

545

46

31

28

Frankfurt Airport

213

88

54

74

46

31

Central Station Sub.

138

71

30

62

33

18

Hauptwache/Sub.

140

68

31

83

53

27

Underground Central Station

166

79

31

92

52

24

Underground Hauptwache

166

85

35

109

65

29

Shopping arcade central station 1

121

57

43

44

24

17

Shopping arcade Hauptwache

97

47

26

61

31

21

Shopping arcade central station 2

324

63

54

73

38

31

Central Station Forecourt 1

135

127

119

35

22

16

Central Station Forecourt 2

212

206

201

37

23

19

Central Station Forecourt 3

230

120

113

50

27

21

Myzeil (Shopping Center)

201

46

32

51

30

26