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Miljøstatistikk 1978: Naturressurser og forurensninger - SSB

Miljøstatistikk 1978: Naturressurser og forurensninger - SSB

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77<br />

Figur 2.11. Endringer i midlere årlig surhetsgrad (pH) <strong>og</strong> overskottssulfat i nedbor. 4 utvalgte<br />

målestasjoner. 1955-1974 Time variation of annual mean pH and concentrations<br />

of excess sulphate in precipitation. 4 selected stations. 1955-1974<br />

Overskuddssulfat Excess sulphate<br />

LISTA<br />

6<br />

4<br />

mg SO4/I<br />

LISTA<br />

2<br />

5,0<br />

pH 4,6<br />

LISTA<br />

Surhetsgrad Acidity<br />

0<br />

6<br />

1955 1960 1965 1970 1975<br />

AS<br />

4,2<br />

1955 1960<br />

5,4 AS<br />

1965 1970<br />

■■•<br />

1975<br />

mg SO4/I<br />

4<br />

pH<br />

5,0<br />

4,6<br />

2<br />

4,2<br />

1955 1960<br />

5,8 KISE<br />

1965 • 1970<br />

1975<br />

6<br />

0<br />

1955 1960 1965 1970 1975<br />

KISE<br />

5,4<br />

4<br />

pH 5,0<br />

mg SO4/I<br />

4,6<br />

2<br />

4,2<br />

1955 1960 1965 1970<br />

5,8<br />

TRYSIL<br />

1975<br />

0<br />

1955 1960<br />

TRYSIL<br />

1965 1970 1975<br />

pH<br />

5,4<br />

5,0<br />

4,6<br />

mg SO4/I<br />

4<br />

2<br />

4,2<br />

1955 1960<br />

1965 1970 1975<br />

0<br />

1955 1960 1965 1970<br />

1975<br />

Kilde: / Source: Brække, F.H. (1976).

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