title: Photocatalytic abatement results from a model street canyon.
abstract: During the European Life+ project PhotoPAQ (Demonstration of Photocatalytic remediation Processes on Air Quality), photocatalytic remediation of nitrogen oxides (NOx), ozone (O3), volatile organic compounds (VOCs), and airborne particles on photocatalytic cementitious coating materials was studied in an artificial street canyon setup by comparing with a colocated nonactive reference canyon of the same dimension (5 × 5 × 53 m). Although the photocatalytic material showed reasonably high activity in laboratory studies, no significant reduction of NOx, O3, and VOCs and no impact on particle mass, size distribution, and chemical composition were observed in the field campaign. When comparing nighttime and daytime correlation plots of the two canyons, an average upper limit NOx remediation of ≤2% was derived. This result is consistent only with three recent field studies on photocatalytic NOx remediation in the urban atmosphere, whereas much higher reductions were obtained in most other field investigations. Reasons for the controversial results are discussed, and a more consistent picture of the quantitative remediation is obtained after extrapolation of the results from the various field campaigns to realistic main urban street canyon conditions.
authors.affiliation: Physikalische und Theoretische Chemie/FB C, Bergische Universität Wuppertal (BUW), Gaußstr. 20, 42119, Wuppertal, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Gallus
authors.affiliation: Université de Lyon, Université Lyon 1, CNRS, UMR5256, IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, Villeurbanne, F-69626, France.|University of Bordeaux, EPOC UMR 5805, F-33405, Talence cedex, France.|CNRS, EPOC UMR 5805, F-33405, Talence cedex, France.
authors.forename: R
authors.initials: R
authors.lastname: Ciuraru
authors.affiliation: Leibniz-Institut für Troposphärenforschung e.V. (TROPOS), Atmospheric Chemistry Department, Permoserstraße 15, 04318, Leipzig, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Mothes
authors.affiliation: Laboratory of Heat Transfer and Environmental Engineering (LHTEE), Aristotle University of Thessaloniki, Box 483, GR 54124, Thessaloniki, Greece.
authors.forename: V
authors.initials: V
authors.lastname: Akylas
authors.affiliation: Laboratory of Heat Transfer and Environmental Engineering (LHTEE), Aristotle University of Thessaloniki, Box 483, GR 54124, Thessaloniki, Greece.
authors.forename: F
authors.initials: F
authors.lastname: Barmpas
authors.affiliation: Belgian Road Research Centre (BRRC), Woluwedal 42-1200, Brussels, Belgium.
authors.forename: A
authors.initials: A
authors.lastname: Beeldens
authors.affiliation: Université de Lyon, Université Lyon 1, CNRS, UMR5256, IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, Villeurbanne, F-69626, France.
authors.forename: F
authors.initials: F
authors.lastname: Bernard
authors.affiliation: Belgian Road Research Centre (BRRC), Woluwedal 42-1200, Brussels, Belgium.
authors.forename: E
authors.initials: E
authors.lastname: Boonen
authors.affiliation: Université de Lyon, Université Lyon 1, CNRS, UMR5256, IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, Villeurbanne, F-69626, France.
authors.forename: A
authors.initials: A
authors.lastname: Boréave
authors.affiliation: Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS (UPR 3021)/OSUC, 1C Avenue de la Recherche Scientifique, Orléans, France.
authors.forename: M
authors.initials: M
authors.lastname: Cazaunau
authors.affiliation: Université de Lyon, Université Lyon 1, CNRS, UMR5256, IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, Villeurbanne, F-69626, France.
authors.forename: N
authors.initials: N
authors.lastname: Charbonnel
authors.affiliation: Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS (UPR 3021)/OSUC, 1C Avenue de la Recherche Scientifique, Orléans, France.
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.affiliation: Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS (UPR 3021)/OSUC, 1C Avenue de la Recherche Scientifique, Orléans, France.
authors.forename: V
authors.initials: V
authors.lastname: Daële
authors.affiliation: Université de Lyon, Université Lyon 1, CNRS, UMR5256, IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, Villeurbanne, F-69626, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Dupart
authors.affiliation: LISA, UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, Créteil, France.
authors.forename: C
authors.initials: C
authors.lastname: Gaimoz
authors.affiliation: Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS (UPR 3021)/OSUC, 1C Avenue de la Recherche Scientifique, Orléans, France.
authors.forename: B
authors.initials: B
authors.lastname: Grosselin
authors.affiliation: Leibniz-Institut für Troposphärenforschung e.V. (TROPOS), Atmospheric Chemistry Department, Permoserstraße 15, 04318, Leipzig, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Herrmann
authors.affiliation: Physikalische und Theoretische Chemie/FB C, Bergische Universität Wuppertal (BUW), Gaußstr. 20, 42119, Wuppertal, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Ifang
authors.affiliation: Physikalische und Theoretische Chemie/FB C, Bergische Universität Wuppertal (BUW), Gaußstr. 20, 42119, Wuppertal, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Kurtenbach
authors.affiliation: LISA, UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, Créteil, France.
authors.forename: M
authors.initials: M
authors.lastname: Maille
authors.affiliation: LISA, UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, Créteil, France.
authors.forename: I
authors.initials: I
authors.lastname: Marjanovic
authors.affiliation: LISA, UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, Créteil, France.
authors.forename: V
authors.initials: V
authors.lastname: Michoud
authors.affiliation: Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS (UPR 3021)/OSUC, 1C Avenue de la Recherche Scientifique, Orléans, France.
authors.forename: A
authors.initials: A
authors.lastname: Mellouki
authors.affiliation: LISA, UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, Créteil, France.
authors.forename: K
authors.initials: K
authors.lastname: Miet
authors.affiliation: Laboratory of Heat Transfer and Environmental Engineering (LHTEE), Aristotle University of Thessaloniki, Box 483, GR 54124, Thessaloniki, Greece.
authors.forename: N
authors.initials: N
authors.lastname: Moussiopoulos
authors.affiliation: Leibniz-Institut für Troposphärenforschung e.V. (TROPOS), Atmospheric Chemistry Department, Permoserstraße 15, 04318, Leipzig, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Poulain
authors.affiliation: LISA, UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, Créteil, France.
authors.forename: P
authors.initials: P
authors.lastname: Zapf
authors.affiliation: Université de Lyon, Université Lyon 1, CNRS, UMR5256, IRCELYON, Institut de recherches sur la catalyse et l'environnement de Lyon, Villeurbanne, F-69626, France.
authors.forename: C
authors.initials: C
authors.lastname: George
authors.affiliation: LISA, UMR CNRS 7583, Université Paris Est Créteil et Université Paris Diderot, Institut Pierre Simon Laplace, Créteil, France.
authors.forename: J F
authors.initials: JF
authors.lastname: Doussin
authors.affiliation: Physikalische und Theoretische Chemie/FB C, Bergische Universität Wuppertal (BUW), Gaußstr. 20, 42119, Wuppertal, Germany. kleffman@uni-wuppertal.de.
authors.forename: J
authors.initials: J
authors.lastname: Kleffmann
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D004784:Environmental Monitoring; D008962:Models, Theoretical; D009589:Nitrogen Oxides / Q000032:analysis; D010126:Ozone / Q000032:analysis; D055668:Photochemical Processes; D055549:Volatile Organic Compounds / Q000032:analysis
chemical_list: D000393:Air Pollutants; D009589:Nitrogen Oxides; D055549:Volatile Organic Compounds; D010126:Ozone
keywords: Air pollution; Outdoor application; Photocatalysis; Street canyon; TiO2