This is the best summary I could come up with:
Back then, it was people like Baroness Jenny Jones, her press chief Ian Wingrove and Simon Birkett at Clean Air in London as well as scientists under Professor Frank Kelly who were highlighting an emerging issue - diesel.
And I remember filming a truck that sprayed a fine mist on Lower Thames Street at night in an attempt to glue particles to the road.
In the 2016 mayoral election air quality was one of the big issues - although a promise of a fares-freeze also drew media attention.
While other pollution-charging schemes had long lead-in times, Ulez expansion gave drivers only nine months to switch vehicles.
But the DfT put strings on the deal and told the mayor to expand the Ulez out to the north and south circulars (it was probably going to happen anyway).
I was told by his advisers at the time this was because the mayor wanted to improve air quality for all Londoners and he wasn't making a political point.
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