Mapping for Change, the social enterprise that I co-founded, has been assisting community groups to run air quality studies for the past 5 years. During this period we have worked in 30 communities across London, carrying out studies with different tools – from collecting leaves, to examining lichens, to using diffusion tubes. We have also followed the development of low-costs sensors – for example, through participation in the AirProbe challenge EveryAware project or hosting a discussion about the early stages of the Air Quality Egg.
We found out that of the simple tools that are available to anyone, and that require little training, NO2 diffusion tubes are very effective. We’ve seen them used as a good sign of the level of pollution, especially from traffic. They sense pollution from diesel vehicles.
We also found that reliable equipment that can measure particulate matter known as PM2.5 (very small dust considered harmful) and other pollutants is expensive – as high as £5000 and more. Unfortunately, low-cost equipment cannot give accurate information that can be used in making a case for action.
Now, after developing the methodology for working with different groups and supporting local efforts, we are launching a crowdfunding campaign to support a large scale data collection campaign using diffusion tubes, with an aim to go beyond and create an equipment library that can be used by communities – free of charge apart from disposable parts (filters) and delivery – that can be shared across London and beyond.