Last edited 24 Jan 2022

Main author

Sandra Turcaniova Other Consultant Website

BREEAM NOx emissions


[edit] Aim and benefits

Under BREEAM UK New Construction, the aim of this credit is to minimise NATIONAL NOx emissions.

There is slight variance to this aim in BREEAM International, where fully electrically heated premises are awarded the credits by default as there are no on site emissions.

[edit] When to consider

[edit] Stage 2

Mechanical Engineer calculates that their concept achieves credits. They tell BREEAM assessor to target 3 credits. This should then gets written into the ERs, ideally in an M&E document and in a BREEAM document.

[edit] Stage 3

Mechanical Engineer doing Stage 3 design should calculate their design still achieves 3 credits. This may be the contractor's engineer, or could still be the client side engineer, depending on how the project is being tendered.

[edit] Stage 4

If there was a design change, as part of either:

The technical submission to the client team regarding the design change, the POL 02 credits should have been recalculated by the contractor side mechanical engineer and approved by the client side engineer,


The client side mechanical engineer should recalculate the POL 02 credits, and confirm their new design complies.

[edit] Stage 5

The contractor's Mechanical Sub Contractor should submit a technical submittal for the kit they propose is procured including updated POL 02 calculations. The AP and/or M&E designers should approve the technical submittal having checked the proposed kit meets POL 02 (among other) requirements.

The contractor should submit purchase orders/delivery notes to BREEAM assessor, along with as built heating/hot water drawings/schematics.

The BREEAM assessor should then confirm accuracy during their site inspection.

[edit] Step by step guidance

Awaiting content

[edit] Questions to ask while seeking compliance

Do you have any electric heating?

Be wary under BREEAM UK New Construction as the NOx emissions for electric heating are so high, that a couple of electric heaters (over the door? small quantity of office areas in an otherwise unheated building?) can make it nearly impossible to achieve many credits.

Did you include the domestic hot water (DHW) heating system into the calculation?

DHW heating can be excluded from the calculation where designer can demonstrate it is less than 10% of the building's total energy consumption (e.g. via Building's Energy Performance Certificate). Point of use water heaters are excluded by default.

Does the calculation use values for sources' operation under normal conditions to meet the building’s heating demand?

Normal conditions means without any redundant capacity, stand-by or back-up source for maintenance or emergency heating.

Does the project incorporate a new CHP? or is it being connected to an existing CHP system?

The reason to ask this is because the NOx for the CHP system will have to be calculated separately, and under BREEAM 2014 UK New Construction schemes and earlier, the methodology is very favourable to CHP leading to more available credits. Note: under BREEAM 2018 UK New Construction this is not the case.

BREEAM UK New Construction 2014 Issue 5.0 Criteria - POL 02

BREEAM International New Construction 2016 Issue 2.0 Criteria - POL 02

[edit] Tools and resources

Awaiting content

[edit] Tips and best practice

District heating system:

For project connected to the district heating system which is not under the developer's control and mandated by a local authority (or other statutory body) maximum number of credits to be awarded. Where this is not mandatory the NOx emissions calculation to be provided. (see KBCN0979) Where a district heating system also generates electricity, this can be used to off-set NOx emissions from grid electricity, the calculation methodology for CHP systems can be used. (see KBCN0857)

[edit] Typical evidence

Typical design stage evidence may include:

[edit] Applicable Schemes

The guidelines collated in this ISD aim to support sustainable best practice in the topic described. This issue may apply in multiple BREEAM schemes covering different stages in the life of a building, different building types and different year versions. Some content may be generic but scheme nuances should also be taken into account. Refer to the comments below and related articles to this one to understand these nuances. See this document for further guidelines.

[edit] Find out more

Air quality

Combined heat and power CHP

Renewable energy

BRE Global does not endorse any of the content posted and use of the content will not guarantee the meeting of certification criteria.

--Sandra Turcaniova 15:11, 03 Jan 2018 (BST)

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