Dutch scientists are putting together remarkable maps showing pollution over Europe and other regions of the globe.
…presenting maps it is developing to track nitrogen dioxide (NO2).
The gas – which comes from motor vehicle exhausts, power plants and industry – is an important precursor in the production of ground-level ozone, part of the photochemical smog that can blight city air, particularly in summer.
BBC: Europe’s pollution hotspots shown »
Link to map »
Writer, photographer, environmental campaigner and "known troublemaker" Dave Walsh is the founder of Blather.net, described both as "possibly the most arrogant and depraved website to be found either side of the majestic Shannon River", and "the nicest website circulating in Ireland". Half Irishman, half-bicycle. He lives in southern Irish city of Barcelona.