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BALTIC SEAENVIRONMENT PROCEEDINGS No. 59 - Helcom

BALTIC SEAENVIRONMENT PROCEEDINGS No. 59 - Helcom

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Table 2. Development of the measuring activities 1986-1990<br />

Constituents<br />

1986<br />

<strong>No</strong>. of measuring stations<br />

A. Nitrogen compounds, routine minimum requirements<br />

1987 1988 1989 1990<br />

NO,- precipitation 25 26 25 25 25<br />

NH,’ precipitation 25 26 25 25 25<br />

B. Nitrogen compounds in air, voluntary/experimental basis<br />

NO, gas 9 8 12 10 9<br />

HNO, - gas +<br />

NO,- - particles<br />

7 6 7 8 8<br />

NH, - gas + 8 6 7 8 8<br />

NH,’ - particles<br />

C. Trace metals, voluntary/experimental basis *)<br />

Pb precipitation 6 7 7 6 4<br />

Cd precipitation 5 6 6 6 4<br />

Zn precipitation 6 7 7 6 4<br />

cu precipitation 0 0 0 0 0<br />

D. Quality assurance<br />

SO,‘- precipitation 25 26 24 25 25<br />

Na’ precipitation 20 19 21 19 23<br />

Mg2+ precipitation 19 18 20 14 22<br />

cl- precipitation 19 19 18 20 21<br />

*) Routine minimum requirement from 1990<br />

53

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