Being rough and hairy is good for many things – but surprisingly, not for leaves trying to strip pollution out of the air.

New research from the University of Surrey suggests being an evergreen tree with smaller leaves makes more of a difference overall - with Yew trees performing particularly well.

It's hoped this new research will prompt planners to choose trees carefully for combatting pollution.

Here's how our researchers put these theories to the test - by setting up planters beside the busy A3 in Guildford:

https://ow.ly/qbsf50Qr9BT