Influence of African dust on the levels of atmospheric particulates in the Canary Islands air quality network |
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| Institution: | 1. Institute of Earth Sciences “Jaume Almera”, CSIC, Lluis Solé i Sabar??s s/n, 08028 Barcelona, Spain;1. Institute of Chemical Sciences, University of Peshawar, 25120, Peshawar, Khyber Pakhtunkhwa, Pakistan;2. Department of Environmental Sciences, University of Peshawar, 25120, Peshawar, Khyber Pakhtunkhwa, Pakistan;1. University of Silesia in Katowice, August Che?kowski Institute of Physics, 75 Pu?ku Piechoty 1, 41-500, Chorzów, Poland;2. University of Silesia in Katowice, Institute of Natural Sciences, B?dzińska 60, 41-200, Sosnowiec, Poland;1. Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California (UABC). Apartado Postal No. 453, Ensenada, B. C. México, Mexico;2. México National Oceanographic Data Center, UABC, Mexico;3. Instituto Tecnológico de Guaymas. Guaymas. Sonora, Mexico;1. Laboratory of Environmental Toxicology, Chulabhorn Research Institute, Lak Si, Bangkok, Thailand;2. Chulabhorn Graduate Institute, Lak Si, Bangkok, Thailand;3. Center of Excellence on Environmental Health and Toxicology, CHE, Ministry of Education, Thailand |
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| Abstract: | Time series of levels of atmospheric particulate matter (TSP and PM10) were studied at 19 air quality monitoring stations in the islands of Tenerife and Gran Canaria (Canary Islands) during the period 1998–2000. After analysing seasonal variations, attention was focused on the detection of high TSP and PM10 events and on the identification of their natural or anthropogenic origins. Back-trajectory analysis and TOMS-NASA aerosol index as well as satellite imagery (SeaWIFS-NASA) were used to identify three types of African dust outbreaks differing in seasonal occurrence, source origin and impact on TSP/PM10 levels. Mean annual and daily TSP and PM10 levels were compared with the forthcoming limit values of the EU Air Quality Directive EC/30/1999, and the results showed that the annual and daily limit values established for 2010 would only be met at rural stations. PM levels at urban background, urban and industrial sites would exceed the 2010 objectives. Only the levels at the urban-background stations would meet the requirements for 2005 despite the fact that the trade winds result in lower levels of atmospheric pollutants in the Canary Islands than in continental environments. The results highlight the role of African dust contributions when implementing the limit values of the EU directive. |
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