Almost all low cost air pollution PM sensors use the poorly documented Chinese devices from PlanTower - and are very happy with it - which is great. However, if one wants to design a long term, high quality (as much as one's pocket can afford) public air monitoring stations, are there any better alternatives?
I am developing one such opensource device - YAAPM (Yet Another Air Pollution Monitor) called Breathe2. This is based around a Sensirion SPS30 which is twice the cost of PlanTower units, but is from a reputed sensor manufacturer with guaranteed 8 years continuous operation life. All is great, but PM10 results are abysmal (also observed here in comparison to reference instruments). The kind people at Sensirion have been very responsive on many issues (helped solved all) but refuse to acknowledge this PM10 issue.
Question: has anyone used Sensirion's SPS30 before? Are there any tricks around it to give realistic PM10 results? Are there any good alternatives to PlanTower?