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<p>The Driver and Vehicle Standards Agency deals with the front line enforcement of
high polluting vehicles. This is primarily dealt with at the annual roadworthiness
test, which DVSA administers, where exhaust emissions are checked once a vehicle becomes
subject to testing due to its age. If the vehicle fails this test, the vehicle cannot
be used on roads until the excess pollution is remedied. DVSA enforce emission outputs
from the commercial vehicle fleet. When vehicles are seen to emit visual smoke, enforcement
action is taken. The Driver and Vehicle Standards Agency also operates a Smoky Vehicle
hot-line where anyone can report a smoky vehicle online and DVSA will then make follow
up enquires about the vehicle.</p><p> </p>
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