Ozone levels in the Spanish Sierra de Guadarrama mountain range are above the thresholds for plant protection: analysis at 2262, 1850, and 995 m a.s.l.
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The Sierra de Guadarrama mountain range, located at 60 km from Madrid City (Spain), includes high valuable ecosystems following an altitude gradient, some of them protected under the Sierra de Guadarrama National Park. The characteristic Mediterranean climatic conditions and the precursors emitted from Madrid favor a high photochemical production of ozone (O3) in the region. However, very little information is available about the patterns and levels of O3 and other air pollutants in the high elevation areas and their potential effects on vegetation. Ozone levels were monitored at three altitudes (2262, 1850, and 995 m a.s.l.) for at least 3 years within the 2005–2011 period. NO x and SO2 were also recorded at the highest and lowest altitude sites. Despite the inter-annual and seasonal variations detected in the O3 concentrations, the study revealed that SG is exposed to a chronic O3 pollution. The two high elevation sites showed high O3 levels even in winter and at nighttime, having low correlation with local meteorological variables. At the lower elevation site, O3 levels were more related with local meteorological and pollution conditions. Ozone concentrations at the three sites exceeded the thresholds for the protection of human health and vegetation according to the European Air Quality Directive (EU/50/2008) and the thresholds for vegetation protection of the CLRTAP. Ozone should be considered as a stress factor for the health of the Sierra de Guadarrama mountain ecosystems. Furthermore, since O3 levels at foothills differ from concentration in high elevation, monitoring stations in mountain ranges should be incorporated in regional air quality monitoring networks.
KeywordsOzone critical levels Ozone risk assessment Mediterranean mountain range Surface ozone Iberian peninsula Sierra de Guadarrama Mountains National Park
This research was funded by ECLAIRE (EU FP7-ENV), AGRISOST (Comunidad de Madrid, S2013/ABI-2717), and NEREA (Spanish Government, AGL2012-37815-C05-03) projects, and by an agreement between the Spanish Ministry of Agriculture, Food, and Environment and CIEMAT on Critical loads and levels. The monitoring station at Alto de las Guarramillas was set up, thanks to an agreement with Abertis-Telecom Company. Authors want to thank the Company and the personnel of the TV-Tower Station Bola del Mundo for their special considerations setting up the monitoring station at the summit and specially for providing access to the station during the hard winter conditions. The monitoring station at Cotos was set up, thanks to an agreement with the Sierra de Guadarrama National Park—Community of Madrid. Special thanks are given to the staff of the Park for their interest and enthusiastic support during the study.
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