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Övervakning av marknära ozon i Göteborgsregionen
2004 (Swedish)Independent thesis Basic level (degree of Bachelor)Student thesis
Abstract [en]

The aim of this paper is to elucidate the situation of air quality concerning ground-level ozone in the region of Gothenburg by means of measure-data examine how the loading of ground-level ozone varying at different places, and in different situations, in the region. The aim is also with basis from the coming EU directive on ground-level ozone in the air, which should be implemented in the Swedish legislation 9 September 2003, and the analyse of measure-data investigate if the existing monitoring of ground-level ozone in the region of Gothenburg comply with the obligations set in the directive. Today ground-level ozone and other common air pollutions are measured continuously at four places in the region of Gothenburg. Measurements in ceiling height are performed by the Environmental administration in Gothenburg in collaboration with the air care programme of the region of Gothenburg, at following places; the shopping precinct Femman at “Östra Nordstaden” in the central part of Gothenburg, Järntorget in the central part of Gothenburg and over the European highway 6 (E6) in the central part of Mölndal. Continuous measurements of ozone at ground level have been performed between the years 1997 to 2002 alongside the E6 at Gårda in the central part of Gothenburg. The measure method used at Järntorget, Mölndal and Gårda is DOAS (Differential Optical Absorption Spectroscopy), whereas UV-absorption is used at Femman. IVL Swedish Environmental Research Institute perform continuous measurements of ground-level ozone by means of UV-absorption at the national monitoring station at Rörvik, which is situated about 40 kilometres south of Gothenburg on the sea at the Onsala peninsula. The results of the analysis and the estimations show that the situation of ozone is worst near the West Coast, around Rörvik. Large quantities of ozone are transported, principally during the summer months, with south-west winds in over Sweden from more densely populated parts of Europe and reach Rörvik. The concentration of ozone at Rörvik lies in general higher than the concentrations in the centre of Gothenburg and in the centre of Mölndal, owing to the fact that the town air contain higher concentrations of nitrogen monoxide (NO), which easily reacts with ozone (O3) and forms nitrogen dioxide (NO2) and oxygen (O2). Sweden follows the legislation of the EU related to ground-level ozone by the Regulation of air pollution by ozone, which came in the year 1997. We will also follow the minimum demands of the new ozone directive there the long-term objective, 120 µg/m3 as an 8-h average, is set on the basis of the World Health Organisation (WHO`s critical level for the protection of human health). Partly more strict, but not binding, environment targets exist however by the Swedish Parliament`s environment quality target “Fresh air”. The generation target to be attained by 2020 corresponds with the recommendation of IMM (The institute for environmental medicine) on 80 µg/m3 as an 1-h average. The results from the calculations of 8-h average values in accordance with the new ozone directive shows that the long-term objective for the protection of human health, to be attained by 2020, was exceeded a number of times between the years1998 to 2002 at all the compared permanent monitoring stations, except Gårda, in the region of Gothenburg. The number of days per annum with 8-h average > 120 µg/m3 do not exceed 25 days, which is the target value for the year 2010. The population information threshold of 180 µg/m3 as an 1-h average was exceeded during the five year period a number of times, as highest 10 times per annum which occurred in 2000 at Rörvik and in 2001 at Gårda. The coming threshold value for warning of population, 240 µg/m3 as an 1-h average, was however not exceeded during the five year period (1998 to 2002). A co-operation between IVL Swedish Environmental Research Institute and the municipality of Gothenburg will be needed to comply with the obligations about monitoring of ground-level ozone set in the new ozone directive. This has to do with the fact that the directive demand two monitoring stations in the densely populated area of Gothenburg at the same time as the municipalities not have the responsibility for the monitoring of ground-level ozone in Sweden. The utmost responsibility lies with the Swedish National Environment Protection Board, which not plan to set up “an own” station in the town of Gothenburg, whereas IVL perform the national monitoring and the information to the public when the concentrations of ozone are high. To comply with the obligations in the new ozone directive measurements of ozone maybe have to be performed at a more representative suburb area than what Mölndal represent. Today the measurements are performed over the busy E6 and thereby not at a certain distance from the area there the highest emissions occur, which the new ozone directive demands.

Place, publisher, year, edition, pages
2004. , 85 p.
Identifiers
URN: urn:nbn:se:kau:diva-54448Local ID: MIV C-2OAI: oai:DiVA.org:kau-54448DiVA: diva2:1103176
Subject / course
Environmental Science
Available from: 2017-05-30 Created: 2017-05-30

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