Abstract
Background
The impact of shipping emissions on urban agglomerations close to major ports and vessel routes is probably one of the lesser understood aspects of anthropogenic air pollution. Little research has been done providing a satisfactory comprehension of the relationship between primary pollutant emissions, secondary aerosols formation and resulting air quality.
Materials and methods
In this study, multi-year (2003–2007) ambient speciated PM10 and PM2.5 data collected at four strategic sampling locations around the Bay of Algeciras (southern Spain), and positive matrix factorisation model were used to identify major PM sources with particular attention paid to the quantification of total shipping emissions. The impact of the emissions from both the harbour of Algeciras and vessel traffic at the Western entrance of Mediterranean Sea (Strait of Gibraltar) were quantified. Ambient levels of V, Ni, La and Ce were used as markers to estimate PM emitted by shipping.
Results and discussion
Shipping emissions were characterised by La/Ce ratios between 0.6 and 0.8 and V/Ni ratios around 3 for both PM10 and PM2.5. In contrast, elevated La/Ce values (1–5) are attributable to emissions from refinery zeolitic fluid catalytic converter plant, and low average V/Ni values (around 1) result mainly from contamination from stainless steel plant emissions. The direct contribution from shipping in the Bay of Algeciras was estimated at 1.4–2.6 μg PM10/m3 (3–7%) and 1.2–2.3 μg PM2.5/m3 (5–10%). The total contribution from shipping (primary emissions + secondary sulphate aerosol formation) reached 4.7 μg PM10/m3 (13%) and 4.1 μg PM2.5/m3 (17%).
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Acknowledgements
This work was supported by research projects from the Spanish Ministry of Environment (GRACCIE-CSD2007-00067 and CALIOPE, 441/2006/3-12.1), the Spanish Ministry of Education and Sciences (DOASUR CGL2007-62505/CLI) and by the Junta de Andalucia. Finally, we would like express our gratitude to Jesús Parga and David Monje for their technical support.
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ESM 1
Online Resource S1 shows the chemical profile of the sources obtained with the PMF analysis in both PM10 and PM2.5 fractions together with the specie variation explained by each source (DOC 70 kb)
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Pandolfi, M., Gonzalez-Castanedo, Y., Alastuey, A. et al. Source apportionment of PM10 and PM2.5 at multiple sites in the strait of Gibraltar by PMF: impact of shipping emissions. Environ Sci Pollut Res 18, 260–269 (2011). https://doi.org/10.1007/s11356-010-0373-4
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DOI: https://doi.org/10.1007/s11356-010-0373-4