Public Perception of Urban Air Quality Using Volunteered Geographic Information Services
© Sonja Grossberndt, Philipp Schneider, Hai-Ying Liu, Mirjam F. Fredriksen, Nuria Castell, Panagiota Syropoulou, Alena Bartoňová. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 license (http://creativecommons.org/licenses/by/4.0), which permits any use, distribution, and reproduction of the work without further permission provided the original author(s) and source are credited.