Bath's Clean Air Zone monitoring reports

Published: 2021-09-09 Updated: 2024-09-06 Subject: Clean Air Zone

We are committed to regularly reporting on the impact of the CAZ on air quality, traffic flow, vehicle compliance and other measures so that we can monitor progress against the plan set out in our full business case. The business case also outlines why a clean air zone is necessary in Bath.

The key objective of the scheme is to reduce Nitrogen Dioxide (NO₂) concentrations to within the annual mean limit of 40 μg/m³ in the shortest time possible at all individual monitoring locations in Bath, while minimising the impact on local businesses and residents.

The timeline below shows where we are in the reporting cycle, and when you can expect to see the next reports. This page will be updated when the reports become available.

1. Start of public engagement on options

   Completed Spring 2018

   View a summary of engagement activities to date including all identified issues, views and comments, with responses.

2. 2. Cabinet decision to introduce a Class C Clean Air Zone

   Completed Spring 2019

   Find out more about the Cabinet decision

3. Launch of financial assistance scheme

   Completed Autumn 2020

   Find out more about the financial assistance scheme

4. Quarter 1 2021 air quality data

   Completed Spring 2021

   See ‘Documents’ below for a link to pre-CAZ historical air quality results.

5. Launch of Clean Air Zone

   Completed March 2021

   Bath's Clean Air Zone launched on the 15 March 2021.

6. Quarter 2 2021 report

   Completed September 2021

   The first quarterly monitoring report is published. The following reports can be viewed at the bottom of this page:

   • Bath's Clean Air Zone quarterly monitoring report April to June 2021 (Q2)
   • Cabinet report on Bath's Clean Air Zone - September 2021 (Q2)
   • Appendix 1 - Measuring the impact of the CAZ reporting timeline
   • Appendix 2 - Investigating concerns of traffic displacement (Q2)

   Due to Covid-19 having an unprecedented impact on travel behaviour in 2020, baseline data from 2019 and 2018 has been used to measure the impact and effectiveness of the zone. Due to seasonal effects, we also compare against similar seasons in this initial quarterly report, in this case the second quarter of the year (April to June), referred to as Q2.

   These files may not be suitable for users of assistive technology.

   Due to Covid-19 having an unprecedented impact on travel behaviour in 2020, baseline data from 2019 and 2018 has been used to measure the impact and effectiveness of the zone. Due to seasonal effects, we also compare against similar seasons in this initial quarterly report, in this case the second quarter of the year (April to June), referred to as Q2.

7. Quarter 3 2021 report

   Completed January 2022

   The second quarterly monitoring report for July to September 2021 has been published. The following reports can be viewed at the bottom of this page:

   • Bath's Clean Air Zone quarterly monitoring report July to September 2021 (Q3)
   • Cabinet report on Bath's Clean Air Zone – December 2021 
   • Appendix 1 - Measuring the impact of the CAZ reporting timeline
   • Appendix 2 - Investigating concerns of traffic displacement (Q3)
   • Appendix 3 - Air quality data: July to September 2021 (Q3)

   Due to Covid-19 having an unprecedented impact on travel behaviour in 2020, baseline data from 2019 and 2018 has been used to measure the impact and effectiveness of the zone. Due to seasonal effects, we also compare against similar seasons, in this case, the third quarter of the year (July to September), referred to as Q3.

   These files may not be suitable for users of assistive technology.

8. Annual report 2021

   Completed June 2022

   A performance report analysing Bath’s air quality, vehicle compliance and traffic volume data from January to December 2021 has been published and can be downloaded below. This covers the first 9 months of the clean air zone’s operation, which launched on 15 March 2021.

   • Summary of Bath's Clean Air Zone Annual Report 2021
   • Bath's Clean Air Zone 2021 Annual Report in full
   • Appendix 1 Measuring the impact (reporting timeline)
   • Appendix 2 Investigating traffic displacement concerns
   • Appendix 3 Full 2021 annual diffusion tube NO2 data
   • Infographic summary of Bath's CAZ annual report

   These files may not be suitable for users of assistive technology.

9. Quarter 4 2021 report

   Completed November 2022

   The fourth quarterly monitoring report for October to December 2021 has been published.

   • Bath's Clean Air Zone quarterly monitoring report October to December 2021 (Q4)
   • Appendix 1 - Measuring the impact of the CAZ reporting timeline
   • Appendix 2 - Air quality data: October to December 2021 (Q4)

   These files may not be suitable for users of assistive technology.

10. Quarter 1 2022 report

    Completed November 2022

    The first quarterly monitoring report for January to March 2022 has been published.

    • Bath's Clean Air Zone quarterly monitoring report January to March 2022 (Q1)
    • Appendix 1 - Measuring the impact of the CAZ reporting timeline
    • Appendix 2 - Air quality data: January to March 2022 (Q1)

    These files may not be suitable for users of assistive technology.

11. Quarter 2 2022 report

    Completed December 2022

    The second quarterly monitoring report for April to June 2022 has been published.

    • Bath's Clean Air Zone quarterly monitoring report April to June 2022 (Q2)
    • Appendix 1 - Measuring the impact of the CAZ reporting timeline
    • Appendix 2 - Air quality data: April to June 2022 (Q2)

    These files may not be suitable for users of assistive technology.

12. Quarter 3 2022 report

    Completed Spring 2023

    The third quarterly monitoring report for July to September 2022 has been published.

    • Bath's Clean Air Zone quarterly monitoring report July to September 2022 (Q3)
    • Appendix 1 Measuring the impact of the CAZ Reporting timeline Q3 2022
    • Appendix 2 - Investigating traffic displacement concerns Q3 2022
    • Appendix 3 - Air quality data July to September (Q3)

    These files may not be suitable for users of assistive technology.

13. Annual report 2022

    Completed August 2023

    A performance report analysing Bath's air quality, vehicle compliance and traffic volume data from January to December 2022 has been published and downloaded by clicking the following links:

    • Summary of Bath's Clean Air Zone Annual Report 2022
    • Bath's Clean Air Zone Full Annual Report 2022
    • Appendix 1: Measuring the impact of the CAZ (reporting timeline)
    • Appendix 2: Full 2022 annual diffusion tube NO2 data
    • Infographic summary of Bath's CAZ annual report

    These files may not be suitable for users of assistive technology.

14. Quarter 4 2022 report

    Completed  August 2023

    The fourth quarterly monitoring report for October to December 2022 has been published.

    • Bath's Clean Air Zone quarterly monitoring report October to December 2022 (Q4)
    • Appendix 1 Measuring the impact of the CAZ reporting timeline Q4 2022
    • Appendix 2 Investigating traffic displacement concerns Q4 2022

    These files may not be suitable for users of assistive technology.

15. Interim report 2023

    Completed Interim update 2023
    • Bath's Clean Air Zone Interim Report 2023
    • Appendix 1 Measuring the impact of the CAZ
    • Appendix 2- Air quality data January to June 2023

16. Annual report 2023

    Active September 2024

    A performance report analysing Bath's air quality, vehicle compliance and traffic volume data from January to December 2023 has been published. View or download the 2023 documents

    We have done our best to make these files suitable for users of assistive technology.

Background data

• Average quarterly NO2 concentrations for sites within the CAZ and within the CAZ boundary
• View current and historical data on air quality across Bath and North East Somerset

Press and media enquiries

If you have a media enquiry, please email your questions or requests to our central communications and marketing team.

Documents

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