Perivale + Pear Tree parks are part of the river Brent catchment, and so I thought it would be interesting to show this Citizen Science project from Thames21 measuring water quality along various catchments in London.
One of the contributors to this data set is the Brent-Imperial run-off project, which has as its particular focus the effect of road run-off from vehicle tyres.
Why not go and explore the Citizen Science project, and perchance even contribute!