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With the recent interest in air quality hitting the news, plus the TV programme earlier this week on an experiment to reduce the particulates and NOx for one day in the Kings Heath area of Birmingham. (it's still here on iPlayer: https://www.bbc.co.uk/iplayer/episode/b09m2djj/fighting-for-air ) I've decided to see if there's a way to make an affordable air quality monitor/data logger that I can fit outside and see what the air quality is like around here, and what impact things like diesel cars driving past, wood burning stoves, weather conditions etc have on it, from day to day. What's interesting is that there are now some pretty affordable particulate monitoring sensors available, certainly good enough for hobby use. Looking around I've found two or three for around £15 to £25 each, that output serial data in the form of a count of each size of particle, over a time bin. From what I've read so far, it looks pretty easy to just sample the air periodically and plot the concentration of particulates within the size bins over time. As an example of the sensors available, here's a link to one that currently sells on Ebay for less than £17 delivered: http://www.aqmd.gov/docs/default-source/aq-spec/resources-page/plantower-pms5003-manual_v2-3.pdf?sfvrsn=2 Not sure when I'll get the time to build and test a unit, but it would be interesting, both to see how the air quality changes in a fixed location, and, perhaps, to fit one to the car so that I can correlate air quality with GPS position and time as I drive around. I''m off now to see if I can find some equally affordable NOx sensors.