Thanks for this comment and ...

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Thanks for this comment and the documents Mr Walder. It seems really a big problem that we cannot "trace back" the responsible source of pollutants efficiently. I hope that in the near future research can come up with something useful to improve the situation as I assume that ordinary citizens are the ones suffering (financially and in terms of health) from the pollution of big industries without knowing about it. And, as usual, environment is threatend by "unknown reactions/elements" of pollutants-thats scary!