1. EU. 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; 2008.
2. Hertel T, et al. Integrated air quality monitoring - combined use of measurements and models in monitoring programmes. Environ. Chem. 2007;4(2):65.
3. Ellermann T, Nygaard J, Nøjgaard JK, et al. The Danish air quality monitoring programme. Annual summary for 2018. Aarhus University, DCE – Danish centre for environment and energy, 83 pp. Scientific report from DCE – Danish centre for environment and energy no. 218; 2020. Available from: https://dce2.au.dk/pub/SR360.pdf.
4. Ellermann T, Nygaard J, Nøjgaard JK, et al. The Danish air quality monitoring programme. Annual summary for 2015. Aarhus University, DCE – Danish centre for environment and energy, 65 pp. Scientific report from DCE – Danish centre for environment and energy no. 201; 2016. Available from: https://dce2.au.dk/pub/SR201.pdf.
5. Ellermann T, Nygaard J, Nøjgaard JK, et al. The Danish air quality monitoring programme. Annual summary for 2016. Aarhus University, DCE – Danish centre for environment and energy, 78 pp. Scientific report from DCE – Danish centre for environment and energy no. 234; 2017. Available from: https://dce2.au.dk/pub/SR234.pdf.