Fant 2220 publikasjoner. Viser side 63 av 222:
Ambient air pollution screening study in Dhaka and Chittagong. 16 February - 01 March 2013. NILU OR
As a part of the Bangladesh Air Pollution Studies (BAPS) project, a screening study of air pollution was performed in Dhaka and Chittagong with assistance from local university partners. The screening study work fell under Task 1 (Emissions Inventory) of the BAPS project.
The screening study was performed in Dhaka from 16 February - 26 February 2013, and Chittagong from 20 February - 01 March 2013. The main objective of the study was to gain an overview of the background concentrations and the spatial distribution of the air pollution in the Dhaka city and Chittagong city areas. This study is also following up on a similar study performed in Dhaka in February 2011. The screening study focused on the following gaseous components in Dhaka and Chittagong: Sulphur Dioxide (SO2), Nitrogen Dioxide (NO2), and Ozone (O3). In addition, samples for persistent organic pollutants (POPs) were collected in Chittagong in connection with the study, which will be reported separately in fall 2013 under a different project.
2014
2014
2014
Bangladesh Air Pollution Studies (BAPS): Task 5 (Industrial emission estimates). Final report. NILU OR
As part of the Bangladesh Air Pollution Studies (BAPS) under Clean Air & Sustainable Environment Project (CASE), stack emission measurements were made on several days at a steel mill and a ceramic industry, both located in the outskirts of Dhaka city. The measurements were made by ChE-BUET Team of the Bangladesh University of Engineering & Technology (BUET), Dhaka. The team has access to all the sophisticated equipment and expertise for emission measurements at industrial stacks. All equipment used were calibrated as per manufacturers' instructions. USEPA/ASTM approved methods were followed for all measurements.
2014
2014
NILU has on behalf of the Norwegian Environment Agency determined the concentration of ionic perfluorinated substances (PFASs), including PFOA, in outdoor clothing. Of the investigated 12 items, no PFAS could be detected at all in only 2 of them (sample 8 and 12). Four samples contained PFOA exceeding the limit of 1 µg/m2. The quality assurance where three replicates of one sample were extracted had a relative standard deviation (RSD) less than 10% for all detected substances except one (PFTrDA). Other quality measures such as recovery calculations and blanks shows that the method used for extraction is suitable for these types of matrices and substances. PFOS was not present in the items investigated, indicating that the textile industry manages to effectively avoid PFOS in their production processes.
2014
2014
Utslipp, spredning og avsetning av SO2 fra Nikel og Zapoljarnij. En WRF-Chem modellstudie. NILU OR
WRF-Chem-modellen har blitt brukt for å studere to episoder med forurensning fra smelteverkene i Nikel og Zapoljarnij, sommerepisoden 2007 og vinteren 2010/11. Meteorologiske inngangsdata fra WRF stemmer bra med analyse fra ECMWF. Modellen underestimerer SO2-konsentrasjoner i episoder, en mulig forklaring er at røykfanen blir midlet ut i modellen, samt at tidsutviklingen av utslippene ikke er korrekt representert. Budsjett over kilder og sluk viser at kjemisk tap er viktigst om sommeren, fulgt av våtavsetning, men våt- og tørravsetning er viktigst om vinteren. WRF-Chem er meget regnekrevende og oppsummert er WRF-Chem best egnet til å studere prosesser og enkeltepisoder.
2014
Denne rapporten vurderer luftforurensningssituasjonen i norske byer og tettsteder i de siste 5 årene. Den presenterer vurderingskriteriene for en mulig revisjon av det norske soneinndeling og evaluerer eksisterende målenettverket i forhold til soneinndeling. Vurderingen tar utgangspunkt i kravene fra direktivene 2008/50/EF om «luftkvalitet og renere luft i Europa» og 2004/107/EF om «arsen, kadmium, kvikksølv, nikkel og polysykliske aromatiske hydrokarboner i luften», samt forurensningsforskriften, kapittel 7. Rapporten presenterer en del anbefalinger for videre oppdatering av målenettverket for lokal luftkvalitet i norske byer og tettsteder.
2014
Air pollution concentrations were estimated the dispersion models as well as the emissions inventories compiled in AirQUIS for Dhaka and Chittagong. Meteorological data were generated from TAPM. Concentration plots for PM10, PM2.5 and SO2 and NO2 were presented for both cities. A scenario for 2020 was developed based on a combination of projected mitigation measures and sector growth based on GDP and population growth rates. In addition, health impacts were assessed based on methodologies from previous studies performed in Asia.
Results show that in general the PM2.5 and PM10 concentration distributions are closely linked to the emissions from brick kilns in the Dhaka area, while in Chittagong the impacts are more spread between the urban sources, brick, and industry and traffic sources. Results also show that PM10 and PM2.5 concentrations exceeds annual limit values, and that the dry season is most critical when it comes to high concentrations of PM10 and PM2.5.
2014