Multiyear analyses of ground-level air contaminants over Paris metropolitan region using real-time observations and air mass backward trajectories--颗粒学报PARTICUOLOGY

Chalbot, M.-C. G., Nicolis, I., Guihenneuc-Jouyaux, C., & Kavouras, I. G. (2016). Multiyear analyses of ground-level air contaminants over Paris metropolitan region using real-time observations and air mass backward trajectories. Particuology, 28, 60-71. https://doi.org/10.1016/j.partic.2015.10.005

Multiyear analyses of ground-level air contaminants over Paris metropolitan region using real-time observations and air mass backward trajectories

Marie-Cecile G. Chalbot ^{a c}, Ioannis Nicolis ^b, Chantal Guihenneuc-Jouyaux ^b, Ilias G. Kavouras ^{a c *}

a University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA
b Université Paris Descartes, 75006 Paris, France
c University of Alabama at Birmingham, Birmingham, AL 35294, USA

10.1016/j.partic.2015.10.005

Volume 28, October 2016, Pages 60-71

Received 28 April 2015, Revised 14 October 2015, Accepted 16 October 2015, Available online 10 February 2016, Version of Record 4 August 2016.

E-mail: kavouras@uab.edu

Highlights

• Local sources were drivers of severe air pollution events in winter.

• Road dust may be a significant source of particulate matter.

• O₃ formation was governed by VOCs-limited conditions yielding a strong weekend effect.

• Regional transport from Western and Central Europe added up to PM₁₀ and PM_2.5 episodes.

Abstract

For the years 2008–2013, particles of diameter <10 and 2.5 μm (PM₁₀ and PM_2.5, respectively), NO_x, SO₂, and O₃ concentrations at urban, suburban, rural, and traffic sites in the Paris metropolitan area were analyzed. Strong spatial variability at traffic and rural sites and relatively uniform profiles at urban and suburban sites for PM₁₀, PM_2.5, and O₃ were observed. The O₃ weekend effect was induced by lower NO_x emissions during the weekend, and favored volatile organic compounds (VOCs)-limited atmospheric conditions. In conjunction with low ambient temperature, these conditions could also favor increased formation of secondary particulate nitrates in winter. Winter air pollution events were associated with multiple pollutants, whereas those observed in spring were caused by high PM₁₀ and PM_2.5 levels. Backward trajectory analyses showed the contribution of sources in Western and Central Europe on days with high PM₁₀, PM_2.5, and O₃, and a local/national component for NO_x and SO₂.

Graphical abstract

Keywords

Air quality; Megacity; Regional transport; PM₁₀; PM_2.5; Ozone

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