Guardian: In the 14 years I have been representing Londoners at City Hall, the problem of air pollution has rarely been off the top of the political agenda. Of all the environmental challenges the capital currently faces, air pollution is by far the most deadly.
In the year 2000, when city government was restored, we knew that exposure to air pollution was associated with serious health conditions like asthma.
Fourteen years and a great deal of scientific research later, we now know that diesel exhaust...