@ Acal BFi we have some experience to share on sensors for standalone moss technology air cleaners for urban spaces. For the last two years our colleague Felix Pluta in Germany has been working with Green City Solutions GmbH https://greencitysolutions.de/). Perhaps we can organise an on-line session with the SAQN community to share some of the experiences made by Green City Solutions in Germany / Europe?
Regards,
Mark and Richard @ Acal BFi