1. COST Action TD1105 EuNetAir webpages: www.cost.eunetair.it.
2. COST Action TD1105 EuNetAir ESSEM domain webpages: http://www.cost.eu/domains_actions/essem/Actions/TD1105.
3. US EPA Draft Roadmap on Next Generation of Air Monitoring (NGAM): http://epa.gov/research/airscience/docs/roadmap-20130308.pdf.
4. AQUILA network on Air Quality National Reference Laboratories (http://ies.jrc.ec.europa.eu/aquila-homepage.html).
5. EU Air Quality Directive 2008/50/EC (http://ec.europa.eu/environment/air/quality/legislation/existing_leg.htm).