i am looking for something similar but for particulate matter instead of co2 like PM2.5. I am also looking for a solution that would work mobile, eg. on a bike. Any help greatly appreciated!
There is a project in Germany which monitors particulate matter. They provide a guide how to build a sensor using a SDS011 and a ESP8266: http://luftdaten.info/en/construction-manual/
Not sure if/how this would work mobile, though.