title: Biogenic volatile organic compounds from the urban forest of the Metropolitan Region, Chile.
abstract: Tropospheric ozone is a secondary pollutant whose primary sources are volatile organic compounds and nitrogen oxides. The national standard is exceeded on a third of summer days in some areas of the Chilean Metropolitan Region (MR). This study reports normalized springtime experimental emissions factors (EF) for biogenic volatile organic compounds from tree species corresponding to approximately 31% of urban trees in the MR. A Photochemical Ozone Creation Index (POCI) was calculated using Photochemical Ozone Creation Potential of quantified terpenes. Ten species, natives and exotics, were analysed using static enclosure technique. Terpene quantification was performed using GC-FID, thermal desorption, cryogenic concentration and automatic injection. Observed EF and POCI values for terpenes from exotic species were 78 times greater than native values; within the same family, exotic EF and POCI values were 28 and 26 times greater than natives. These results support reforestation with native species for improved urban pollution management.
authors: Universidad de Chile, Facultad de Ciencias Químicas y Farmacéuticas, Laboratorio de Química de la Atmósfera, Sergio Livingston 1007, Santiago, Chile. Electronic address: mprendez@ciq.uchile.cl.
authors: Margarita
authors: M
authors: Préndez
authors: Virginia
authors: V
authors: Carvajal
authors: Karina
authors: K
authors: Corada
authors: Johanna
authors: J
authors: Morales
authors: Francis
authors: F
authors: Alarcón
authors: Hugo
authors: H
authors: Peralta
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002677:Chile; D002947:Cities; D004784:Environmental Monitoring; D009589:Nitrogen Oxides / Q000032:analysis; D010126:Ozone / Q000032:analysis; D013729:Terpenes / Q000032:analysis; D014197:Trees / Q000502:physiology*; D055549:Volatile Organic Compounds / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D009589:Nitrogen Oxides; D013729:Terpenes; D055549:Volatile Organic Compounds; D010126:Ozone
keywords: BVOCs; Chile; Exotic and native arboreal species; Metropolitan Region; Photochemical Ozone Creation Index; Photochemical Ozone Creation Potential