When I lived in Uganda, I used to cycle to work every day, and was aware of the pollution building as I cycled down the hill into the city centre.
Air pollution monitor and example output. The vertical lines mark when we lit a match in the same room as the sensor.
I wanted to measure this pollution, so using the (very cheap) shinyei sensor and a mobile phone investigated what we could measure, and with what accuracy. I’ve not got very far yet, but this funding app gives and idea about what we’ve done and what we hope to achieve.