Airparif, which measures pollution levels in the city, reported that levels of the nitrogen dioxide N02 gases found in the city dropped substantially during the event on 27 September - despite the ban applying to only 30 per cent of the French capital.
A calculation algorithm was developed to remove the urban background, contributed by other sources than traffic in the selected street, from the roadside measured pollution levels.
Dr Sean Semple, of the University of Aberdeen, whose research contributed to the campaign, said: "In the past five years our research group has measured pollution levels in over 100 homes across Scotland.
Limitations include the long lead times for adult cancers and use of distance rather than modelled or directly measured pollution levels as a proxy for exposure.
In April a flock of racing pigeons took to the skies of London to measure air pollution levels after it was found that nitrogen dioxide kills nearly 9,500 people in the capital each year.
The agency continuously measures air pollution levels of various pollutants at a busy intersection of two main roads in Reykjavik (Grensasvegur-Miklabraut) where on average around 60,000 cars cross daily [ 16].
This agency administers an extensive air monitoring program that measures air pollution levels in national parks for visibility, gaseous pollutants, and atmospheric deposition.
In October, Beijing introduced a system of emergency measures if pollution levels remained hazardous for three days in a row, including closing schools, shutting some factories, and restricting the use of government cars.
Fourthly, no quantitative air pollution exposures assessments were conducted during the study; we were not able to validate the participant's responses by checking individual addresses or by measuring ambient pollution levels in or near their homes, as we did not have addresses.
