I've been keeping an eye on the MQ135 readings over the last few days.

Prevailing winds conditions here mean that normally the exhaust gases from Eastbourne Water Works are carried elsewhere. However, recently (since 4 Aug) the wind direction has been more from the south and east, tending to blow the fumes more inland. Consistently when the smell is bad the MQ135 readings are raised, and vice versa. The MQ135 is frustrating sometimes because you cannot tell exactly which gas it is responding to, but here that broad response may be useful.

Next steps are to:

  1. Start to record and graph the MQ135 readings on the same time axis as PM and weather data.
  2. Move from qualitative measurement to quantitative measurement of sensor data.