Air pollution

A new study suggests estimated deaths linked to toxic air in London fell by about 40% in five years.

Clean Air Bradford says the zone has led to about 732 fewer GP visits for respiratory conditions.

Critics claim the scheme is negatively impacting businesses in Bradford.

Before the CAZ was introduced, the council says air pollution was responsible for shortening the lives of about 900 people per year.

One in eight of the council's fleet vehicles still break its own Clean Air Zone requirements.

Local authorities say the data is "vital" for ensuring they are taking steps to restore the heathland.

Researchers say Bradford could "become a model for how cities respond to environmental challenges".