Scientists at the University of Birmingham say the decrease in the city is about 7%.
The Clean Air Zone is focused on reducing levels of nitrogen dioxide produced by older cars and lorriesBirmingham's Clean Air Zone has had a smaller effect on pollution than was previously thought.Now scientists at the University of Birmingham say the drop is about half that at about 7%.
The CAZ has worked in cutting NO2 levels but the scientists argue calculating the drop in pollution is much more complex than it first appeared. What the researchers at the university have done is use clever maths to strip out all those various factors and just focus on the effect of the CAZ itself.Talking to one of the scientists who did the study, Prof Zongbo Shi, this does not mean the CAZ is not beneficial to the city.This is very apparent when you use the research to zoom in to street level - you can see a drop in NO2 in Colmore Row in the business district, as people ditch their polluting vehicles.
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