NO2 levels
Nitrogen dioxide levels were reduced by up to 47% by lowering the speed limits in previous trials
A new study looked into asthma cases in children in 18 European countries, including the UK, Denmark, France and Spain
Nitrogen dioxide levels were reduced by up to 47% by lowering the speed limits in previous trials
A new study looked into asthma cases in children in 18 European countries, including the UK, Denmark, France and Spain