List of Available Tools

Overview

All available tools hosted on the LAQM website are summarised below. The links provided direct you to the tool page where these can be downloaded. The tools are available in a variety of file formats although mainly in .pdf, .xls, .xlsm and .xlsb formats. Some of the tools contain macros and some users of MS Excel may need to alter their macro security settings to get these tools to run.

This page contains the following sections. Use the links below to jump to a specific section.

• Monitoring Tools – Diffusion Tubes
• Monitoring Tools – Particulate Matter
• Monitoring Tools – Other
• Background Concentrations
• Emissions Tools
• Screening Tools
• Road Traffic Related Tools

Current Versions

Monitoring Tools – Diffusion Tubes

Local Bias Adjustment and Precision Calculator

Assists diffusion tube users in calculating the precision and accuracy of their results, in co-location studies where diffusion tubes are compared with automatic analysers.

Author: Ricardo-E&E
Last Updated: February 2011

National Bias Adjustment Factors

A database of bias adjustment factors determined from Local Authority colocation studies throughout the UK.

Author: Bureau Veritas / NPL
Last Updated: September 2024

Annualisation Tool

Assists diffusion tube users in annualising diffusion tube data, where data capture for the year is between 3 and 8 months (or between 25% and 75% if the Defra monitoring calendar has not been followed).

Author: Bureau Veritas
Last Updated: March 2025

Diffusion Tube Data Processing Tool

Assists diffusion tube users in overall data processing by amalgamating the following individual LAQM processing tools:

• Annualisation tool;
• Precision and accuracy tool – calculation of local bias;
• NO₂ fall off with distance calculator.

Author: Bureau Veritas
Last Updated: March 2025

Monitoring Tools – Particulate Matter

Volatile Correction Model

Corrects TEOM concentrations to “gravimetric equivalent” values.

Author: Kings College
Last Updated: April 2012

Monitoring Tools – Other

Automatic Data Processing Tool

Assists with the processing of NO₂, PM₁₀, and PM_2.5 automatic monitoring data and the population of associated annual reporting data tables.

Author: Bureau Veritas
Last Updated: March 2025

NO₂ Fall Off with Distance Calculator

Estimates the annual mean nitrogen dioxide concentration at one distance from a road, using measurements made at a different distance from the same road.

Author: Bureau Veritas
Last Updated: March 2018

NO_x to NO₂ Calculator

Derives 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.

Author: Ricardo-E&E
Last Updated: November 2024

Background Concentrations

Background Maps (NO_x, NO₂, PM₁₀ and PM_2.5)

2021-2040 Background maps (NO_x, NO₂, PM₁₀ and PM_2.5).

Author: Ricardo-E&E
Last Updated: November 2024

NO₂ Adjustment for NO_x Sector Removal

NO₂ Adjustment for NO_x Sector Removal.

Author: Bureau Veritas
Last Updated: November 2024

Background Maps for Northern Ireland (based on NIOS coordinates)

Background maps for Northern Ireland (based on NIOS co-ordinates).

Author: Ricardo-E&E
Last Updated: November 2024

Background Maps for Scotland (NO_x, NO₂ and PM₁₀)

2018-2030 Background maps (NO_x, NO₂ and PM₁₀) for use in review and assessment.

Author: Ricardo-E&E
Last Updated: September 2020

NO₂ Adjustment for NO_x Sector Removal (Scottish specific)

NO₂ Adjustment for NO_x Sector Removal for use with the background maps for Scotland.

Author: Ricardo-E&E
Last Updated:  January 2020

Emissions Tools

Road Transport Emission Factors Toolkit

The toolkit allows the user to calculate vehicle emissions for multiple road links based on vehicle fleet composition, traffic speeds and road type. This version supersedes any previous road transport emission
factors made available.

Author: Bureau Veritas
Last Updated: March 2025

Emission Factors Database

This database contains the emissions factors used in the 2022 UK National Atmospheric Emissions Inventory (NAEI), as well as factors specially designed for local inventories.

Author: Ricardo-E&E
Last Updated: 2024

1×1km Emission Estimates

Provides high level emission estimates for 2022 for each 1×1km grid square in the UK.

Author: Ricardo-E&E
Last Updated: 2024

Point Source Emissions Estimates

Provides emissions by point source (i.e. for the large power generation and industrial sources).

Author: Ricardo-E&E
Last Updated: 2024

Screening Tools

DMRB Screening Tool

A road transport screening tool for use by Local Authorities to assess the impact of traffic generation on air quality.

Author: Highways Agency
Last Updated: April 2009

Industrial Emissions Screening Tool

A screening tool for NO₂, PM₁₀, SO₂, Benzene and 1,3-Butadiene to assess whether the industrial plant of concern needs further assessment.

Author: Bureau Veritas
Last Updated: April 2017

Stack Height Calculator for SO₂ from Small Boilers

A chimney height calculation spreadsheet for sulphur dioxide emissions from small boilers.

Author: Bureau Veritas
Last Updated: January 2001

Biomass Emissions Screening Tool

A screening tool for NO₂, PM₁₀ and PM_2.5 to assess whether the biomass plant of concern needs further
assessment.

Author: Bureau Veritas
Last Updated: April 2017

Road Traffic Related Tools

Annual Average Daily Traffic Flows

Provides estimated traffic flows on every link of the ‘A’ road and motorway network in Great Britain. The data are for the years 2000 to 2023.

Author: DfT
Last Updated: 2025

Road Traffic and Speed statistics

Average daily motor vehicle flows by road class, GOR and country.

Author: DfT
Last Updated: 2025

TEMPro

Trip End Model Presentation Program – can be used to provide summaries of traffic growth using data from the National Transport Model.

Author: DfT
Last Updated: December 2023