Journal
ATMOSPHERIC ENVIRONMENT
Volume 45, Issue 28, Pages 4907-4914Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2011.06.002
Keywords
Ultrafine particles; Ship emissions; Vehicle exhaust; Urban air quality
Funding
- Ministry of Science and Innovation of Spain [GRACCIE CSD2007-006, REDMAAS CGL2010-11095-E]
- Department of Innovation, Science and Enterprise of Government of Andalusia (AER-REG) [P07-RNM-03125]
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Two years of experimental data (2008-2009) of particle number (> 2.5 nm diameter) and black carbon concentrations and of gaseous pollutants recorded in the ambient air of a coastal city were analysed in order to assess the impact of ship emissions on the ultrafine particles (UFPs, diameter <100 nm) concentrations in urban ambient air. The observed relationship between particle number and the other air pollutants, allowed segregating the contribution of vehicle exhaust and of ship emissions to the UFP concentrations in the urban ambient air. Vehicle exhausts resulted in high concentrations of UFP, black carbon and NOx during the early morning, when UFPs showed concentrations 15-30 x 10(3) cm(-3). Pollutants linked to this source rapidly decreased when inland sea breeze started to flow. However, this airflow resulted in inland transport of ship plumes (emitted in the harbour and in the sea) into the city and in high concentrations of SO2, NOx and UFP from mid morning to the evening. In this context, UFPs showed concentrations 35-50 x 10(3) cm(-3), being the 65-70% of these linked to ship emissions mostly related to SO2 (gas phase precursor). UFPs pollution is a matter of concern due to adverse effects on human health. Up to the date, most of studies on urban air quality and UFPs have focused on vehicle exhaust emissions. This study shows how inland transport of ship plumes due to sea breeze blowing results in UFPs pollution in coastal cities. (C) 2011 Elsevier Ltd. All rights reserved.
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