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NOx to NO2 Calculator

This calculator allows local authorities to derive NO₂ from NO_x wherever NO_x is predicted by modelling emissions from roads. The calculator can also be used to calculate the road component of NO_x from roadside NO₂ diffusion tube measurements.

It incorporates the impact of expected changes in the fraction of NO_x emitted as NO₂ (f-NO₂) and changes in regional concentrations of NO_x, NO₂ and O₃.

The following files may be of interest:

An updated version of the calculator, Version 2.1, released 22 January 2010 (XLS 6MB)
The basis for the new f-NO₂ values and background maps used in the calculator (PDF 50KB)
The earlier Version 1.1 (XLS 9MB) is online if still required

Important: Please save these files to a local drive before using by right-clicking the link and choosing Save Target As... or Save Link As..., it may not function correctly if opened directly from the link in your browser window.

You may also be interested in the NO₂ and Diffusion Tubes FAQs

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