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Figure: Peak Lead Concentration

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Source: NIWA

Text description of image

The chart shows the peak lead concentration in various New Zaland cities from 1980-2000:

Year

Lead concentration (mg m-3)

Auckland

Hamilton

Wellington

Christchurch

Dunedin

Guideline

1980

1.5

 

 

1.15

 

0.2

1981

1.55

 

 

0.9

 

0.2

1982

1.45

 

 

1.13

 

0.2

1983

1.75

1

 

1.05

 

0.2

1984

1.7

1.1

1.12

1.05

0.85

0.2

1985

1.8

1.4

1.2

1.05

0.87

0.2

1986

1.6

0.9

1.25

0.9

0.5

0.2

1987

1.4

0.55

0.75

0.6

0.3

0.2

1988

1.1

0.5

0.62

0.3

0.32

0.2

1989

1.1

0.7

0.6

 

0.33

0.2

1990

1.1

0.4

0.45

 

 

0.2

1991

0.8

0.3

0.42

 

 

0.2

1992

0.55

0.3

0.4

 

 

0.2

1993

0.45

0.2

 

 

 

0.2

1994

0.5

0.15

 

 

 

0.2

1995

0.4

0.12

 

 

 

0.2

1996

0.3

0.05

 

 

 

0.2

1997

0.2

0.01

 

 

 

0.2

1998

0.02

0.01

 

0.08

 

0.2

1999

0.01

 

 

0.02

 

0.2

2000

 

 

 

 

 

0.2

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