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Intercomparison of global nitrogen dioxide trends derived from multiple satellite instruments. NILU F
2013
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Background concentrations in Norway - Temporal averaging and uncertainty assessment. NILU OR
A system for providing approximate spatial and temporal estimates of the surface background concentrations of PM10 , PM2.5, NO2 , and O3 for a typical year in Norway has been established at NILU in recent years. In 2013, the system was further improved and expanded by carrying out two main tasks: Firstly the spatial component of the system was extended from previously a single year to a 3-year average, thus decreasing the impact of inter-annual variability. Secondly, a preliminary validation of the background estimates was carried out and an approximate uncertainty was calculated for four species in the dataset and is now communicated to the user on the project website. The validation results indicate that overall the average estimated concentrations follow the average observed concentration fairly well. This is particularly true for PM10 and PM2.5. The averaged estimates for O3 and NO2 also follow the averaged observations relatively closely, although NO2 is clearly underestimated at all four validation stations. In terms of quantitative uncertainty estimates for the hourly estimates at the level of individual species, O3 is the parameter which was found to have the lowest uncertainty of all four species. While the median absolute uncertainty for hourly O3 estimates was found to be 18.7 ¿g m-3, the median relative uncertainty was only 33.8 %. Both PM10 and PM2.5 had significantly higher uncertainties, with a median relative uncertainty for the hourly estimates of 90 % and 88 %, respectively. Finally, the hourly estimates for NO2 also showed quite high relative uncertainties with a value of 73 %.
2013
Abu Dhabi Ports Company has procured two fixed Air Quality Monitoring Stations, one situated in Area A of KIZAD outside of the ADPC Site HQ building (ADPC Site Office station) with the other in Khalifa Port (ADPC Port station) adjacent to the EMAL conveyer. NILU UAE commissioned these two sites in December 2012 and has been operating them since then. The results presented in this report have been based upon air quality and meteorological data collected from these two fixed Air Quality Monitoring stations during the reported month.
2013
NILU gjennomførte screeningprosjektet i 2013. Denne rapporten beskriver resultatene og disse er sammenlignet og diskutert med tidligere funn i både Norge og andre regioner.
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The link between springtime total ozone and summer UV radiation in Northern Hemisphere extratropics.
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The report describes future emission factors under different scenarios.
2013