After the phasing out of leaded gasoline, Pb emissions to the atmosphere dramatically decreased, and other sources became more significant. The contribution of unleaded gasoline has not been sufficiently recognized; therefore, we evaluated the impact of Pb from unleaded gasoline in a relatively pristine area in Subarctic NE Norway. The influence of different endmembers (Ni slag and concentrate from the Nikel smelter in Russia, PM₁₀ filters, and traffic) on the overall Pb emissions was determined using various environmental samples (snow, lichens, and topsoils) and Pb isotope tracing. We found a strong relationship between Pb in snow and the Ni smelter. However, lichen samples and most of the topsoils were contaminated by Pb originating from the current use of unleaded gasoline originating from Russia. Historical leaded and recent unleaded gasoline are fully distinguishable using Pb isotopes, as unleaded gasoline is characterized by a low radiogenic composition (²⁰⁶Pb/²⁰⁷Pb = 1.098 and ²⁰⁸Pb/²⁰⁶Pb = 2.060) and remains an unneglectable source of Pb in the region.

在逐步淘汰含铅汽油之后，大气中的Pb排放量显着减少，其他来源也变得更加重要。人们还没有充分认识到无铅汽油的贡献；因此，我们评估了挪威亚北极东北部一个相对原始地区的无铅汽油中铅对铅的影响。不同端部成员的影响（来自俄罗斯Nikel冶炼厂的镍渣和精矿，PM ₁₀使用各种环境样品（雪，地衣和表土）和铅同位素示踪法确定了总铅排放量的过滤器和流量）。我们发现雪中的铅与镍冶炼厂之间存在密切的关系。但是，地衣样品和大多数表层土壤均受铅污染，而铅是目前使用的来自俄罗斯的无铅汽油所致。使用铅同位素可以完全区分历史铅和最近的无铅汽油，因为无铅汽油的特征是低放射性成分（²⁰⁶ Pb / ²⁰⁷ Pb = 1.098和²⁰⁸ Pb / ²⁰⁶ Pb = 2.060），并且在该地区仍然是不可忽视的Pb来源。