1. (2022, December 23). The United Nations Human Settlements Programme (UN-Habitat), World Cities Report 2022. Available online: https://unhabitat.org/sites/default/files/2022/06/wcr_2022.pdf.
2. (2022, December 23). Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on Ambient Air Quality and Cleaner Air for Europe OJ L 152, 11.6.2008. Available online: https://eur-lex.europa.eu/legal-content/en/ALL/?uri=CELEX%3A32008L0050.
3. Department of Ecology, State of Washington (2022, December 23). Air Monitoring Site Selection and Installation Procedure, Available online: https://apps.ecology.wa.gov/publications/documents/1602021.pdf.
4. (2022, December 23). Greater London Authority, Guide for Monitoring Air Quality in London, Available online: https://www.london.gov.uk/sites/default/files/air_quality_monitoring_guidance_january_2018.pdf.
5. Johnston, S.J., Basford, P.J., Bulot, F.M.J., Apetroaie-Cristea, M., Easton, N.H.C., Davenport, C., Foster, G.L., Loxham, M., Morris, A.K.R., and Cox, S.J. (2019). City Scale Particulate Matter Monitoring Using LoRaWAN Based Air Quality IoT Devices. Sensors, 19.