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The population exposure without PM10 fraction attributable to road traffic is shown in Figure 6. Compared to total PM10, the frequency distribution changes considerably. Most people would live in areas with PM10 values less than 20 µg/m3. In France and Switzerland, less than 3% of the population would live in areas with PM10 greater than 20 µg/m3. In Austria, this portion is higher due to an increased non-traffic caused regional PM10 background. However, in all three countries, the reduction of the percent values in higher PM10 concentration classes is substantial and indicates that road traffic contributes considerably to these PM10 concentration classes. Population weighted PM10 averages. | International Journal of Health Geographies BioMed Central Research Traffic-related air pollution associated with prevalence of asthma and COPD chronic bronchitis. A cross-sectional study in Southern Sweden Anna Lindgren 1 Emilie Stroh1 Peter Montnémery2 Ulf Nihlén3 4 Kristina Jakobsson1 and Anna Axmon1 Open Access Address Department of Occupational and Environmental Medicine Lund University Lund Sweden 2Department of Community Medicine Lund University Lund Sweden 3Astra Zeneca R D Lund Sweden and 4Department of Respiratory Medicine and Allergology Lund University Lund Sweden Email Anna Lindgren - anna.lindgren@med.lu.se Emilie Stroh - emilie.stroh@med.lu.se Peter Montnémery - peter.montnemery@med.lu.se Ulf Nihlén - Ulf.Nihlen@med.lu.se Kristina Jakobsson - kristina.jakobsson@med.lu.se Anna Axmon - anna.axmon@med.lu.se Corresponding author Published 20 January 2009 Received 2 October 2008 International Journal of Health Geographies 2009 8 2 doi 10.1186 1476-072X-8-2 Accepted 20 January 2009 This article is available from http www.ij-healthgeographics.cOm content 8 1 2 2009 Lindgren et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http creativecommons.org licenses by 2.0 which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background There is growing evidence that air pollution from traffic has adverse long-term effects on chronic respiratory disease in children but there are few studies and more inconclusive results in adults. We examined associations between residential traffic and asthma and COPD in adults in southern Sweden. A postal questionnaire in 2000 n 9319 18-77 years provided disease status and self-reported exposure to traffic. A Geographical Information System GIS was used to link geocoded residential addresses to a Swedish road database and an emission database for NOx. Results Living .