More than one in 24 deaths in Yorkshire's cities are now linked to air pollution.
That's according to a new report released by the think tank Centre for Cities'. That's 21 times the regional rate of deaths from traffic accidents.
In total, an estimated 1,514 air pollution related deaths happen in Yorkshire's cities each year.
The proportion of air pollution related deaths are highest in Hull. There were 128 deaths in just one year in the city, nearly 5% of the adult deaths in the city.
Barnsley has the smallest proportion of air pollution related deaths in Yorkshire, with 94 deaths across the town.
These deadly levels of PM2.5 are currently legal in England, Wales and Northern Ireland, despite breaking the World Health Organization's air pollution guidelines.
Andrew Carter, Chief Executive of Centre for Cities, said: