By atregenna@thekmgroup.co.uk (Amy Tregenna) Medway is the most polluted part of the county, says Friends of the Earth. The environmental organisation has analysed data on air quality across the country and found large areas of Strood, Rochester, Chatham and Gillingham suffered with much higher levels of pollution than anywhere else in Kent and the south east. As part of the study, England was divided into neighbourhoods, each with an average population of 1,700 people. The amount of nitrogen dioxide (NO2) and particulate matter (PM2.5) – the two deadliest air pollutants – was calculated for e…