Government analysis shows clean air zones are most effective option in reduction of nitrogen oxides
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Total reduction in NOx emissions over 10 years, tonnes
Clean air zones
24,000
Retrofitting buses, HGVs and black cabs
10,000
Ultra low emission vehicles
2,000
Vehicle labelling
700
Scrappage
400
Influencing driving style
350
Government buying standards
100
Reducing speed limits
50
0
5,000
10,000
15,000
20,000