I've read about natural pollutants--things such as mildews, fungi, even sediment from erosion. Assuming there is more wind at higher altitudes, there will also be more erosion at higher altitudes. This could result in more polluted water in Mountain Lake, as more sediment will be deposited in the lake at the top of a mountain than in Pandapas Pond, where there is less wind and erosion.
On the other hand, pollution may also be affected by run-off. This would cause more pollution in ponds or lakes of lower altitudes, as the run-off would drain into them. Mountain Lake would not be as strongly influenced by run-off as Pandapas Pond.
If these are sources of pollution in either Mountain Lake or Pandapas Pond, then yes, altitude does play a role in the levels of pollution.
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