The agency attributes the lion's share of the 96% fall to the installation of cleansing equipment at a single magnesium works at Porsgrunn, a highly industrialised peninsula south-west of Oslo. This alone cut Norway's total release by some 525g per year, SFT estimates.
Other factors include more stringent regulation, "the phasing-out of chlorinated compounds," and closure of an iron ore pelletising plant in Sør-Varanger which accounted for additional cuts of 40g per year from 1995. A number of small sources remain, which are more difficult to supervise than the larger factories and waste incineration plants, SFT notes.
In the meantime, three of the latter - a municipal incinerator in Oslo, and hospital incinerators in Tromsø and Levanger - have been ordered to step up their monitoring and reporting of dioxins on the grounds that emissions last year exceeded permitted levels.
SFT, tel: +47 22 57 34 00.
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