I have thought about Purple Air , the personal sensor, but going to wait a bit longer. Finances.
I bought two air purifiers that have sensors that speed up the fan when the air is not so great (Winix 5300*2)/ I got my daughter one because she has asthma. Being the 38 year old she is, she farted near the sensor, the indicator went from normal to deep red, the fan roared to action as we laughed. I am guessing that if a toot can trip the sensor, probably someone could actually produce one that theycould get the readings directly.
What of late really bothers me is that we buy things, but have to have a web or phone connection to get the data from it. Bloomsky is a perfect example, no way to get pictures or the data, but have to rely on servers working. I guess that is partly why I am going to wait on the Purple Air, but you know I want one