Non-Road Mobile Machinery (NRMM)
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You can also read the Accessibility statement for Non-Road Mobile Machinery.
London's Low Emission Zone for Non-Road Mobile Machinery
Non-Road Mobile Machinery (NRMM) is a broad category. It includes mobile machines and transportable industrial equipment or vehicles, fitted with internal combustion engines but not made to transport goods or passengers on roads.
NRMM, particularly within construction, is a significant London air pollution contributor. The NRMM Low Emission Zone uses Mayoral and London Borough planning powers to control NRMM emissions on construction sites.
Current standards
Like the Ultra Low Emission Zone, the NRMM Low Emission Zone makes all engines with a 37 kW - 560 kW power rating meet emission standards based on engine emission “stages”.
Standards can depend on where the construction site is, and machine type:
- Current standards are stage IV for construction machinery operating in the Central Activities Zone (CAZ) and Opportunity Areas (OAs), and stage IIIB in the rest of London.
- Stage IV has not been directly defined for variable speed engines smaller than 56 kW. In most cases, these engines must meet stage V if they are in the CAZ and OAs.
- Stages IIIB and IV have not been defined for machines with constant speed engines, like generators - these machines need to meet Stage V across all of London.
Development zones map
All machinery in the Central Activities Zone and Opportunity Areas (shown in orange) should meet at least stage IV.
Find out more about London's Opportunity Areas.
All machinery on sites in the rest of London (in blue) should meet at least stage IIIB.
When you register a new site, you can drop a pin on its location to identify which zone it's in.
Future standards changes
NRMM Low Emission Zone standards will get tighter over time. From:
- 1 January 2025, standards will be stage IV across London.
- 1 January 2030, standards will be stage V across London.
- 1 January 2040, only zero emission machinery will be allowed.
NRMM Register
Most NRMM Low Emission Zone sites must log all machinery (with a 37 - 560 kW power rating) with the online register.
New users must create an account before using the site.
Existing users can use their account to:
- register a new site
- register machinery on an existing site
- accept an invitation to register machinery at someone else’s site.
The register is the only way site operators can get exemptions or approvals for retrofitted or specialist equipment.
Site operator guidance
Read the NRMM practical guide for site operator information - including how to find a machine's engine stage, and how to make sure your site is compliant.
Compliance by Retrofit
If your machine does not meet your site's emission standards, you can retrofit additional pollution control equipment instead of replacing machines or engines.
There are various retrofit systems, and some are more effective than others. So that fitted systems are suitable for the NRMM Low Emission Zone, we only accept retrofits listed on the Energy Saving Trust website.
All retrofitted machines within scope (between 37 - 560kW) need an exemption. To find out how to submit an exemption for retrofitted NRMM, see the full Exemption and Retrofit Policy below.
Exemptions
In limited circumstances we can issue exemptions for machines not meeting standards, that have not been retrofitted.
You must provide evidence when applying for an exemption, and every request is considered case-by-case.
All NRMM exemption requests must have as much evidence as you can provide, to support them.
This should include full site-specific details on why you need the exemption, and a dated supplier statement from the last 6 months, confirming the site has no compliant solutions.
Your should also provide supplier outstanding order proof, showing they are working towards a compliant fleet.
Loading data (or equivalent) to demonstrate onsite power demand, with explanations of applicable loading issues.
Clarity on other technologies considered to try and overcome loading issues including (for example):
- Generator re-sizing
- Battery Energy Storage Systems (BESS) where appropriate
- Kinetic energy storage (external Flywheel unit)
- Chaining smaller generators together
- Alternative fuels and/or Diesel Exhaust Fluids (DEF) less prone to exhaust blockages
For full exemption criteria details, refer to the Exemption and Retrofit Policy below.
We will continue supporting individual site operators and construction companies with site specific queries, please contact us at [email protected].
Contact us
Get in touch with the NRMM team
NRMM Emission standards are due to change, from 1 January 2025, standards will be EU stage IV across London.
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