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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
2009
Modelled sources of airborne microplastics collected at a remote Southern Hemisphere site
Airborne microplastics have emerged in recent years as ubiquitous atmospheric pollutants. However, data from the Southern Hemisphere, and remote regions in particular, are sparse. Here, we report airborne microplastic deposition fluxes measured during a five-week sampling campaign at a remote site in the foothills of the Southern Alps of New Zealand. Samples were collected over 24-hour periods for the first week and for 7-day periods thereafter. On average, atmospheric microplastic (MP) deposition fluxes were six times larger during the 24-hour sampling periods (150 MP m−2 day−1) than during the 7-day sampling periods (26 MP m−2 day−1), highlighting the importance of sampling frequency and deposition collector design to limit particle resuspension. Previous studies, many of which used weekly sampling frequencies or longer, may have substantially underestimated atmospheric microplastic deposition fluxes, depending on the study design. To identify likely sources of deposited microplastics, we performed simulations with a global dispersion model coupled with an emissions inventory of airborne microplastics. Modelled deposition fluxes are in good agreement with observations, highlighting the potential for this method in tracing sources of deposited microplastics globally. Modelling indicates that sea-spray was the dominant source when microplastics underwent long-range atmospheric transport, with a small contribution from road dust.
Elsevier
2024
2014
2014
2010
2011
NILU - Norsk institutt for luftforskning har beregnet konsentrasjoner av NO2, SO2 og PM10 i luft, samt nitrogen- og svovelavsetning som følge av utslipp til luft fra Hammerfest LNG med tilhørende skipstrafikk. Beregningene viser at konsentrasjon av NO2 kan overskride Klifs anbefalte luftkvalitetskriterier, men ikke EUs grenseverdier eller Nasjonale mål. For SO2 og PM10 er det ikke overskridelser av noen grenseverdier. Videre viser beregningene en maksimal avsetning på 14 mg N /m2 og 11 mg S /m2 per år.
2012
Modellering av vulkanaske i norsk luftfrom. Pkt. 1.3 Enkle forbedringer av utslippsestimat. NILU OR
Rapporten beskriver hvordan en transportmodell brukes til å simulere utslipp av aske fra vulkanutbrudd og hvordan askeutslippene kan beskrives i modellen. En rekke metoder for beregning av askeutslipp er presentert og utarbeidelse av forbedrede askeutslippestimat ved manuell analyse av satellittdata er presentert.
2013
De tre transportmodellene EEMEP, SNAP og FLEXPART har simulert askespredning og avsetning fra Eyjafjalljökull utbruddet i 2010. Alle modellene har blitt kjørt med identisk kildeledd, og modellresultatene har blitt sammenlignet i detalj opp mot hverandre og opp mot observasjoner. Dette gir en økt forståelse av modellenes evne til å simulere askespredning, og av ulikhetene mellom modellresultater som ofte oppstår, spesielt under en askesituasjon i nær sanntid.
2014
2017
Modelling and mapping of degradation of built environment from available data and GIS based information tools. Umwelt-bundesamt. Texte 24/99
1999
2014
2025
2015
1999
2000
2000