@CASHcampaigners @GrahamStretch @Pedalperspectiv @EalingCouncil @BetterEaling @EalingCyclists @London_Cycling @RatrunsWEaling @VisitSouthall @GoSouthall I recorded air quality by Southall Gasworks for a month in 2018 using a similar device. (docs.google.com/spreadsheets/d…).