Impacts of maritime shipping on air pollution along the US East Coast

Abstract µ m (PM2.5), nitrogen dioxide (NO2), sulfur dioxide (SO2), and ozone (O3) – as well as nitrogen oxide (NO), and we calculate their concentrations in the presence and absence of ship emissions along the US East Coast, particularly in the proximity of major ports. 2.5 concentrations over the ocean and over a few areas inland. The 98th percentile of the 24 h average PM2.5 concentrations (the “design value” used by the US Environmental Protection Agency) increased by up to 3.2 µ g m- 3 2 concentrations, up to 95 % over the Atlantic and up to 90 % over land in coastal states, which represents a ∼ 45  ppb increase in the SO2 design values in some states. The 98th percentile of the hourly NO2 concentrations also increased by up to 15 ppb at the major ports and along the shore. In addition, we find that the impact of shipping emissions on O3 concentrations is not uniform, meaning that ships affect ozone pollution in both positive and negative ways: over the ocean, O3 concentrations were significantly higher in the presence of ships, whereas O3 concentrations decreased in the presence of ships in major coastal cities. Our simulation results show that ships emit significant amounts of fresh NO in the atmosphere, which then helps scavenge O3 in volatile organic compound (VOC)-limited areas, such as major ports. By contrast, over the ocean (NOx -limited regime), enhanced NOx concentrations due to ships contribute to the formation of O3 and therefore enhance O3 concentrations. Overall, due to the dominant southwesterly wind direction in the region, the impacts of ships on air pollutants mainly remain offshore. However, in coastal states near major ports, the impacts are significantly important.

Object Details

• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch

References and Relationships

• Bibliographic citation: Impacts of maritime shipping on air pollution along the US East Coast ; volume:23 ; number:23 ; year:2023 ; pages:15057-15075 ; extent:19 ; Atmospheric chemistry and physics ; 23, Heft 23 (2023), 15057-15075 (gesamt 19)

Classification and Topics

• Classification: Soziale Probleme, Sozialdienste, Versicherungen

Contributors, Places and Time

• Creator: Golbazi, Maryam ; Archer, Cristina

Further information

• DOI: 10.5194/acp-23-15057-2023
• URN: urn:nbn:de:101:1-2023121403354654600924
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 15.08.2025, 7:23 AM CEST