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<p>On average, local road traffic and road traffic background are respectively responsible
for around 60% and 18% of UK roadside NOx concentrations. On average, buses contribute
around 16% of the NOx concentrations from local road traffic. We do not have statistics
on how much of the NO2 exceedance is attributed to buses.</p><p> </p><p>Since 2010
the Government has provided almost £150 million to help bus operators and local authorities
purchase cleaner buses, and £67 million to retrofit existing bus fleets to a minimum
Euro VI standard.</p>
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