He added that the authority would analyse data from the scheme and was committed to working with KCC to tackle the city's traffic problems, lower pollution, ease flow, and find a permanent solution at Westgate Towers.

BBC: Westgate Towers road scheme 'dividing Canterbury' ends

"The pollution indoors is generally higher than outdoors, possibly because of an imbalance between the flow of pollutant from outside and its removal from inside to outside, " the researchers say.

BBC: Is your floor a health hazard?