Mud, mud, glorious mud - and glorious dust, smells and mould too - feature in Dirty City. Kate McLean (http://twitter.com/katemclean) tells us about Smell Maps of cities (which you can see at http://sensorymaps.com), Jay Owens (http://twitter.com/hautepop) explores the social history of dust, and Anna Mavrogianni talks about the dirty dangers lurking within and without our homes.

The show was put together by Kaisa Puustinen twitter.com/kaisaph with Hannah Sender twitter.com/HannahSender and Martin Zaltz Austwick twitter.com/sociablephysics .