Examiners from the Driver and Vehicle Standards Agency (DVSA) will now be routinely checking lorries they stop at the roadside for emissions cheat devices.
The national rollout of checks follows a successful year-long pilot. During the pilot, DVSA enforcement staff caught 449 emission cheats at five sites across the country.
Drivers caught with an emissions cheat device or a faulty emissions control system have 10 days to remove the device and repair their emissions system.
If they continue to use a device or fail to repair the system, they can be fined £300 and have their vehicle taken off the road.
DVSA will then carry out a follow-up investigation with the operator. DVSA can refer its findings to the Traffic Commissioners for Great Britain, who have the power to strip a company of its licence to operate.
Cheat devices mean a lorry can produce up to 20 times more dangerous emissions.
This new checking procedure commenced on 1 September 2018.