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NOx to NO2 Calculator

Overview

This calculator allows users to derive NO2 from NOx wherever NOx is predicted by modelling emissions from roads. The calculator can also be used to calculate the road component of NOx from roadside NO2 diffusion tube measurements. Local authorities are advised to use the latest version of the tool for all future work that is based upon use of the 2018 reference year background maps and the EFT v10.1 onwards.

The current version of the calculator (v8.1) should only be used with the 2018 Reference Year Background Maps and the Emissions Factors Toolkit v10.1, and can be used for years 2018 to 2030. Guidance on how to use the NOx to NO2 Calculator is available in the Background Maps User Guide provided below.

Current Version

Documents

NOx to NO2 Calculator v8.1

Released: August 2020 (XLSM, 3.2MB)

Basis for the f-NO2 Values and Background Map Information used in v8.1

Released: March 2020 (PDF, 86KB, 1 page)

Background Maps User Guide

Released: August 2020 (PDF, 1.1MB, 44 pages)

Details

Version 8.1 updates version 7.1 to use updated estimated regional concentrations and updated f-NO2 values from NAEI 2017 projections that are consistent with the 2018 base year LAQM background maps. It also provides the capability to include user defined f-NO2 values in both the NOx to NO2 and NO2 to NOx conversion calculations. This version covers the years 2018 to 2030.

Please Note: Users of the updated LAQM tools should be aware that the projections in the 2018 reference year background maps and associated tools are based on assumptions which were current before the Covid-19 outbreak in the UK. In consequence these tools do not reflect short or longer term impacts on emissions in 2020 and beyond resulting from behavioural change during the national or local lockdowns.

Previous Version

Documents

NOx to NO2 Calculator Version 7.1 

Released: April 2019 (XLS, 3.2MB)

Basis for the f-NO2 values and background maps used in Version 7.1

Released: May 2019 (PDF, 71KB, 1 page)

Details

Whilst local authorities are advised to use the latest version of the NOx to NO2 Calculator for all future work, in support of ongoing work, the previous version of the NOx to NO2 Calculator has been provided.

For older versions of the NOx to NO2 Calculator please contact the LAQM Helpdesk for further assistance.

LAQM Helpdesk
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