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Pol 02 - Local air quality

Information correct as of 21stMay 2024. Please see for the latest compliance information.

Emissions – measuring heating demand - KBCN0182

Emissions for all heat sources should be measured under normal operating conditions which are when all heat sources from the building plant are operating to their maximum design heat outputs to meet the building's heating demands. Where plant is designed to operate below maximum capacity, for example multiple or modular systems or standby boilers,the emissions should still be calculated for the plant operating to meet the building’s heating demand. Any redundant capacity or standby plant should not be included.  

Extensions – Retaining existing heating plant - KBCN0336

When assessing an extension where existing heating plant is retained, the current emissions output should be used to determine compliance. The emissions should not be taken from the original manufacturers information at the time of installation.  

LZC technologies – energy centre or other LZCs connected at a later stage - KBCN0267

If a project specifies LZCs that have been proposed in the feasibility report which reduce emissions, and/or will be connected to a site-wide energy centre operational at a later stage of the phased development, after the Post Construction Stage review has been submitted, the Energy and Pollution issues can be assessed as follows: In a phased development where the primary heating system will be upgraded at a later stage than the building being assessed, a commitment to install the new heating source must be made in the General Contract Specification (as per the BREEAM requirements). BREEAM does not specify a particular time for phasing as it is difficult to set parameters, however as a rule building users should have to wait the least time possible before they can use the upgraded heating source. For the quality audit, two Energy model outputs/EPCs must be produced at the final stage - one with the actual interim system installed for building control, and one for the BREEAM assessment which can include the predicted energy from the proposed energy centre.  Additionally, the legally binding general contract specification for the new heating source must be submitted with details of the timescales proposed for the completion of the second phase of work. Where this approach is to be followed BREEAM must be consulted in each case to ensure that the arrangements are sufficiently robust to award the credits. BREEAM seeks to recognise the environmental impacts of a building's energy use throughout its life, therefore temporary arrangements can be accommodated, provided there is robust evidence on future connection to the permanent systems.
24/08/2022 - Applicability to UKNC V6 confirmed

NOx emissions – Units of measure - KBCN1393

For gas and oil appliances, NOx emissions should be measured on a dry basis at 0% excess oxygen, in accordance with the Ecodesign regulations.

Pol 02 benchmarks – Oil-fired boilers - KBCN1208

It has come to our attention that there is an error in Table 12.4 in Pol 02, relating to the NOx emission benchmarks for oil-fired boilers. The table below confirms the correct benchmarks.  
Appliance type and unit Fuel 1 credit (Low pollution location) 1 credit (High pollution location) 2 credits (Low pollution location) 2 credits (High pollution location)
Boiler (mg/kWh) Oil 56 73 56 55 67 50
This will be confirmed in the next re-issue of the technical manual, but can be applied immediately in all issues of the UK NC2018 scheme.

Information correct as of 21stMay 2024. Please see for the latest compliance information.