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In this report, we investigate the relative expanded uncertainty (REU) formula for comparing low-cost sensors (microsensors) and reference measurements. The purpose of the REU formula is to check if microsensor measurements follow the data quality objective (DQO) of the European Air Quality Directive 2008/50/EC to be considered equivalent to a reference instrument. The project aimed to obtain a good understanding of the REU formula for its proper use in current and future projects involving microsensors.
NILU
2020
2020
Determining the Bio‐Based Carbon Content of Surfactants
In response to a mandate from the European Commission, the European Committee for Standardization (CEN) called on the technical committee CEN/TC 276 to develop a European standard (EN 17035) to define bio‐based surfactants and enable quantification of the bio‐based carbon content of surfactants based on radiocarbon analyses. This analytical approach was tested through directly contracted analyses and through a round robin procedure at commercial facilities in Europe. Initial results were unsatisfactory and further investigation identified issues surrounding the degree of homogenization in the samples. In general, the samples were only homogeneous at the gram level while the maximum quantity of material that could be introduced to the analytical process was at the milligram level. Having identified the root cause of the discrepancies between measured and expected results, new samples were sent to six European laboratories. The results were satisfactory indicating linearity and accuracy across the measurement range.
AOCS Press
2020
The geographic distribution of NO2-concentrations in air in the area around E16 Arna – Vågsbotn (Bergen) was mapped by
NILU after request by Statens vegvesen. Measurements were carried out with passive air samplers at 10 sites in the area
Gaupås-Kalsås-Blinde. The project was carried out in winter (28. January – 24. March 2020) in an area which often is subject to inversion conditions in wintertime.
The winter 2019-2020 proved to be a mild winter, no inversion conditions were registered. The NO2-concentration was highest in the first week and decreased gradually every week. During the two last weeks, traffic was reduced as a consequence of pandemia measures. The average concentration at the most polluted site over the entire measurement period was 22.9 μg/m3. Comparison of results from the measurement area with observations from monitoring stations in Bergen showed that the NO2-level close to E16 was as high as at traffic stations in Bergen.
NILU
2020
2020
2020
2020
2020
2020
Denne rapporten presenterer databasen i ICP Materialer for perioden oktober 2017 – november 2018. Den inkluderer
miljødata fra ICP Materialer trend-eksponeringsprogrammet for 2017 – 2018, og i tillegg data for temperatur, relativ
fuktighet og nedbørsmengde tilbake til slutten av forrige års-eksponering i oktober/november 2015. Databasen består av
meteorologiske data (T, RF og nedbørsmengde) og forurensningsdata, som gasskonsentrasjoner, mengde ioner i nedbør, partikkelkonsentrasjoner og mengde avsatte partikler.
NILU
2020
2020
2020
2020