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PM<sub>10</sub> Chemical Profile during North African Dust Episodes over French West Indies
oleh: Philippe Quénel, Jade Vadel, Céline Garbin, Séverine Durand, Olivier Favez, Alexandre Albinet, Christina Raghoumandan, Stéphanie Guyomard, Laurent Yves Alleman, Fabien Mercier
Format: | Article |
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Diterbitkan: | MDPI AG 2021-02-01 |
Deskripsi
The French West Indies are periodically affected by North African dust episodes (NADE) resulting in PM<sub>10</sub> concentrations exceeding air quality standards. The aim of the present study was to decipher the PM<sub>10</sub> chemical profile during NADE over Guadeloupe. PM<sub>10</sub> samples were collected daily at a rural site and an urban site during five episodes between April and October in 2017. During these events, the median PM<sub>10</sub> mass concentrations were, on average, 2 to 5 times higher than in the post-episode baseline period. Sampled filters were analyzed for their quantification of chemical constituents including carbonaceous fractions (elemental and organic carbon, EC/OC), anions/cations and levoglucosan, 51 elements, and 57 selected organic species. An orthogonal partial least squares discriminant analysis (OPLS-DA) was conducted to identify the specific chemical profile of PM<sub>10</sub> during NADE: 16 elements were identified as the most discriminant between the NADE and the control samples with mass concentration levels twice as high during a NADE. Among them, only two (Mn and V) are classified as emerging pollutant while no limit values exist for the other ones. The extensive characterization of the NADE PM<sub>10</sub> chemical profile we performed is a key step to assess the chemical exposure of French West Indies populations during such events.