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What’s on It
- Short summaryThe Finding
- Donut chart of the mixSource of Roadside NO2
- TableWhat the Four Zones Did
- The one thing to act onRecommendation
- Cycle diagramHow a Zone Goes Live
- Big numberIf Extended
Sample One-Pager. Company and figures are made up.
Urban Air Quality: Policy Brief
Evidence summary for the transport committee
The Finding
Roadside nitrogen dioxide fell 31% in the four zones that charged older vehicles, and 4% in the eight that did not.
The gap opened within seven months and has held for three years.
Source of Roadside NO2
Diesel cars and vans46%
Heavy goods29%
Buses and coaches15%
Other10%
What the Four Zones Did
| Zone | Charge | NO2 change | Cost to run |
|---|---|---|---|
| Central | $12.50 daily | -38% | $4.1M |
| Riverside | $8.00 daily | -31% | $2.7M |
| Northgate | $8.00 weekday | -29% | $2.2M |
| Docklands | $6.00 peak only | -24% | $1.6M |
Recommendation
Extend peak-only charging to the six inner zones first. It captures roughly three quarters of the benefit at under half the running cost, and it is the option with existing camera coverage.
How a Zone Goes Live
If Extended
-26%
Projected NO2 across the six inner zones
$9.4M a year to run, against $10.6M for full daily charging.
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