The Pollution Clock Project

The backs of Dr Katrin Wilhelm and Dr Phani Karamched as they face two monitors full of SEM sample data. There is a keyboard on the desk and a Zeiss machine to one side


News update

Following the feature below, from April this year, the SEM images we provided to Dr Katrin Wilhelm have now appeared on mainstream television. 

If you watch the first episode of Channel 4/More4's 'Cleaning Britain's Greatest Treasures', the SEM images appear (with another image provided by Oxford Pathology) at 43 minutes, 30 seconds. 


(Original feature)

Dr Katrin Wilhem of the School of Geography and the Environment visited the David Cockayne Centre for Electron Microscopy on 5 April to view some SEM-produced data.  Dr Wilhem is making a documentary for Channel 4, exploring the Pollution Clock Project..

Dr Phani Karamached conducted the scan before both he and Dr Wilhelm analysed the data.  The sample was taken from a stone wall from Marylebone Church, and pollution caused by the burning of wood, coal and gasoline was still visible in the crust, some of which was up 200 years old.  Other samples Dr Wilhelm has analysed (such as a sample from New College Lane in Oxford, dating back to the 14th century), contained pollution which was over 400 years old.

We were delighted to be able to assist Dr Wilhelm in this exciting project.  As Dr Wilhelm says:


"The overarching aim of my research is to make built heritage fit for the twenty-first century.  Thus, my research aims at understanding how the historic environment can be of 'service' for society (ie 'built heritage environment system services' and 'Learning from the Past'). 

Consequently, the Pollution Clock Project establishes historic surfaces as long-term geochemical archives to advance air pollution research with implications for healthier cities.  This kind of research is highly interdisciplinary and thrives through collaborations between the social and natural sciences such as between the School of Geography and the Department of Materials".