1. (2023, February 22). 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. Available online: https://eur-lex.europa.eu/legal-content/DE/ALL/?uri=celex%3A32008L0050.
2. Muncrief, R. (2023, February 27). Briefing—A Comparison of Nitrogen Oxide (NOx) Emissions from Heavy-Duty Diesel, Natural Gas, and Electric Vehicles. Available online: https://theicct.org/publication/a-comparison-of-nitrogen-oxide-nox-emissions-from-heavy-duty-diesel-natural-gas-and-electric-vehicles/.
3. Lippmann, M., and Leikauf, G.D. (2020). Environmental Toxicants: Human Exposures and Their Health Effects, John Wiley & Sons. [4th ed.].
4. Outdoor Air Pollution: Nitrogen Dioxide, Sulfur Dioxide, and Carbon Monoxide Health Effects;Chen;Am. J. Med. Sci.,2007
5. Respiratory health effects of air pollution: Update on biomass smoke and traffic pollution;Laumbach;J. Allergy Clin. Immunol.,2012