A new pollutant has been identified which will sit uncomfortably on the usual list of cars, planes and industry: coniferous Nordic forests.
According to environmental experts at Stockholm University, the pines and spruces of northern Europe create masses of small particles which drift up to 1,000 metres into the atmosphere.
"The levels in Stockholm city centre are 100-200 micrograms per cubic metre, compared to 4-5 in our forest measurements."
published in www.thelocal.se (swedish news in English)
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