Using grid data in order to relate Traffic-Related Air Pollution and Dementia Incidence in Northern Sweden.
Scientists from Umeå University in Sweden have over a 15 year period assessed the relation between long-term exposure to traffic-related air pollution and dementia incidence. The study was carried out in Umeå, one of the Swedish cities where air quality in the city’s central areas was worse than the European air quality standards (limit values) for nitrogen dioxide and particulate matter.
Making use of a 50 m x 50 m grid with annual mean nitrogen oxide levels in combination with the residential address of 2000 participants showed a geographical pattern. Most of the 300 dementia incidences were located in the more polluted centre compared to the city outskirts.