I understand your concerns and can assure you that tackling this problem is a top priority for the Department for the Environment, Food and Rural Affairs. While significant improvements have been made in air quality over many years, more needs to be achieved.
Over the past five years the Government has committed over £2 billion to help bus operators upgrade their fleets, reduce pollution from a range of vehicles such as refuse trucks and fire engines through cutting edge technologies, and promote the development of clean alternative fuels such as powering taxis in Birmingham with liquid petroleum gas. There is also a planned consultation on options for limiting emissions from diesel generators.