Details of Ryburn Valley Plume Plotter

This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the Ryburn Valley version of Plume Plotter.

Stacks and buildings

Building measurements are taken from [2] and [4].

The first image below shows the layout of the stacks and buildings modelled at both incinerators.

The second image shows the layout of the stack and buildings modelled at the Rochdale Road incinerator. North is at the top. Numbers show the heights of buildings and stacks, in metres. Higher buildings are a lighter shade of pink.

The third image shows the layout of the stack and buildings modelled at the Mearclough Road incinerator.

Stack measurements

Details of the Rochdale Road incinerator (elevation 85.1m) are taken from [1]:

Details of the Mearclough Road incinerator (elevation 75.5m) are taken from [3]:

The following values are used for albedo, Bowen ratio, and roughness length. None of these are specified in [1]:


Both incinerators are expected to operate 5 days/week. We assume that they operate continuously, but to ensure that the annual means are correct, we multiply the emission rates by 5/7.

For the Rochdale Road incinerator, the emission rates of pollutants are taken from [1]:

PollutantEmission rate
per second
Oxides of nitrogen180 mg
Particulates9.1 mg
TOC9.1 mg
Hydrogen chloride9.1 mg
Hydrogen flouride910 μg
Carbon monoxide46 mg
Sulphur dioxide46 mg
Cadmium and thallium45.6 μg
Mercury45.6 μg
Other metals456 μg
Dioxins and furans91.3 pg
PAHs913 ng
PCBs4.56 μg

The emission rates of the Mearclough Road incinerator are the same as the above, multiplied by 0.14/0.18 [3].

Background levels

The background levels of pollutants are taken from [1] and [3]. These are:

concentration per m3
Oxides of nitrogen16.4 μg
Particulates14.4 μg
TOC320 ng
Hydrogen chloride310 ng
Hydrogen flouride500 ng
Carbon monoxide131 μg
Sulphur dioxide4.1 μg
Cadmium and thallium100 pg
Mercury1.2 ng
Other metals12.61 ng
Dioxins and furans8 fg
PAHs62 pg
PCBs44 pg

Weather data

Wind speed, wind direction, temperature, pressure, and solar radiation are the latest values reported by one of two weather stations. If a value is not available from the primary weather station it is obtained from the secondary weather station. (Some weather stations do not measure solar radiation at all.) The primary weather station is and the secondary weather station is .

Upper air data is the latest reported by the Nottingham upper air station.


1. Proposed Waste Recovery Plant, Rochdale Road, Sowerby Bridge: Air Quality Assessment. Entran Ltd. September 2015. Planning application 17/00113/WAM, document "17_00113_WAM-AIR_QUALITY-1006369.PDF".

2. Environmental Statement Volume 2. Sol Environment Ltd. January 2017. Planning application 17/00113/WAM, document "17_00113_WAM-ENVIROMENTAL_STATEMENT_2-1006378.pdf".

3. AIR QUALITY ASSESSMENT: Energy From Waste Plant, Mearclough Rd, Sowerby Bridge. Sol Environment Ltd. November 2016.

4. Site layout. Sol Environment Ltd. December 2016.