Opened the debate
Poor air quality contributes to the early deaths of up to 43,000 people every year in the UK. Nitrogen dioxide levels in Sheffield were above legal limits, contributing to around 250 to 500 deaths annually. Older polluting vehicles and buses are major sources of problems, with an average bus fleet age of about 12 years. Retrofitting devices have shown considerable variability, with many not performing at the expected Euro 6 standard.