schools, with the government saying that they will be funding for 7000 ventilation units. professor mark mon williams from the university of leeds is leading a trial of air cleaning equipment in 30 schools in bradford. welcome, thank you forjoining us. can you tell us how that trial is working? what is being done, and are you able to deduce anything from its impact yet? you able to deduce anything from its im act et? ., ., , , ., impact yet? there are two bits to the trial, impact yet? there are two bits to the trial. and impact yet? there are two bits to the trial, and the impact yet? there are two bits to the trial, and the first impact yet? there are two bits to the trial, and the first is - impact yet? there are two bits to the trial, and the first isjust - the trial, and the first is just understanding what of the issues associated with putting these technologies into schools. it sounds very straight forward, put technology in school, but in practice there are a number of is