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2. Alphasense Ltd: Alphasense Application Note AAN 110 Environmental
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3. Alphasense Ltd: Technical specification, NO-A4 Nitric Oxide Sensor 4-Electrode, available at: http://www.alphasense.com/WEB1213/wp-content/uploads/2016/03/NO-A4.pdf (last access: 22 August 2019), 2016a.
4. Alphasense Ltd: Technical specification, NO2-A43F Nitrogen Dioxide Sensor 4-Electrode, available at: http://www.alphasense.com/WEB1213/wp-content/uploads/2018/12/NO2A43F.pdf (last access: 22 August 2019), 2016b.
5. Alphasense Ltd: Technical specification, CO-A4 Carbon Monoxide Sensor 4-Electrode, available at: http://www.alphasense.com/WEB1213/wp-content/uploads/2017/01/COA4.pdf (last access: 22 August 2019), 2017a.