Acid rain (pH-value < 5.6) results from the formation of acid in the atmosphere caused by sulfur- and nitrogen oxide emissions. Damage to the vegetation (e.g., damage to forests) and by corrosion at buildings are the result. The acidification potential (AP) of sulfur dioxide is defined with the value 1, and other gases are regarded in its acidification potential in accordance with sulfur dioxide. In EATOS for the value Q = 10 the AP-value 1.9 was fixed, because the highest AP-value amounts to 1.88 (ammonia). The classification of the remaining Q-values can be seen in Table 16, where Q is calculated from an AP-value according to Q = [AP × 5 + 0.5].
Table 16 Assignment of acidification potentials (AP) to the weighting factor QAcidification
Q |
|
AP [SO2 := 1] |
|
||
1 |
< |
|
0.3 |
||
2 |
0.3 |
to |
0.5 |
||
3 |
0.5 |
to |
0.7 |
||
4 |
0.7 |
to |
0.9 |
||
5 |
0.9 |
to |
1.1 |
||
6 |
1.1 |
to |
1.3 |
||
7 |
1.3 |
to |
1.5 |
||
8 |
1.5 |
to |
1.7 |
||
9 |
1.7 |
to |
1.9 |
||
10 |
1.9 |
|
< |
||
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