This is a short overview of the COST Action TD1105 EuNetAir - European Network on New Sensing Technologies for Air-Pollution Control and Environmental Sustainability - funded in the framework European Cooperation in the field of Scientific and Technical Research (COST) during the period 2012-2016. The main objective of the Concerted Action is to develop new sensing technologies for Air Quality Control at integrated and multidisciplinary scale by coordinated research on nanomaterials, sensor-systems, air-quality modelling and standardised methods for supporting environmental sustainability with special focus on SMEs. This international Networking, coordinated by ENEA (Italy), includes over 120 big institutions and over 200 international experts from 31 COST Countries (EU-zone) and 7 Non-COST Countries (extra-Europe) to create a S&T critical mass in the environmental issues. © 2015 The Authors. Published by Elsevier Ltd.