1. Air quality in Europe 2022 report, European Environment Agency, Luxemburgo, Publications Office of the European Union, (2022). https: //www.eea.europa.eu/publications/air-quality-in-europe-2022, 2022.(accessed 10 February 2023).
2. Compliance with the annual NO2 air quality standard in Athens. Required NOx levels and expected health implications;Chaloulakou;Atmos. Environ.,2008
3. An overview of photocatalysis phenomena applied to NOx abatement;Ângelo;J. Environ. Manage.,2013
4. An overview on limitations of TiO2-based particles for photocatalytic degradation of organic pollutants and the corresponding countermeasures;Dong;Water Res.,2015
5. M. Cruz-Yusta, M. Sánchez, L. Sánchez, Metal oxide nanomaterials for nitrogen oxides removal in urban environments, C.Maccato, D. Barreca (Eds.), Tailored Functional Oxide Nanomaterials: From Design to Multi-Purpose Applications, Wiley-VCH GmbH,2022, pp.229276. ISBN-13:978-3527347599; https://doi.org/10.1016/j. apsusc.2017.08.192.