Table 12 Rural background. Descriptive data of regional air pollution at a monitoring station in a rural area. Annual mean concentrations of traffic-related pollutants measured at Vavihill 1985–2006. Data source: IVL Swedish Environmental Research Institute Ltd. http://www.ivl.se/miljo/

1985

5.14

2.36

60.2

1986

2.27

59.9

1987

5.47

2.11

55.1

1988

3.90

1.84

57.7

1989

3.93

2.66

56.5

1990

2.98

2.36

55.0

1991

2.64

2.08

51.3

1992

2.06

1.72

56.0

1993

1.70

1.98

57.4

1994

1.17

1.78

58.6

1995

1.35

1.92

59.3

1996

1.31

1.77

63.0

1997

0.67

2.05

58.8

1998

0.74

1.87

54.6

1999

0.55

1.66

59.1

2000

0.45

1.70

57.6

16.0

2001

0.42

1.37

60.2

15.4

2002

0.37

1.39

66.6

16.3

2003

0.52

1.54

62.9

18.6

2004

0.37

1.48

58.5

13.8

2005

0.49

1.47

61.0

15.2

2006

0.50

1.59

64.3

17.3