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Bath's Clean Air Zone monitoring reports
Published: Updated: 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.
Start of public engagement on options
Completed
Cabinet decision to introduce a Class C Clean Air Zone
Completed
Launch of financial assistance scheme
Completed
Quarter 1 2021 air quality data
Completed
See ‘Documents’ below for a link to pre-CAZ historical air quality results.
Launch of Clean Air Zone
Completed
Quarter 2 2021 report
Completed
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.
Quarter 3 2021 report
Completed
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.
Annual report 2021
Completed
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.
Quarter 4 2021 report
Completed
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.
Quarter 1 2022 report
Completed
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.
Quarter 2 2022 report
Completed
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.
Quarter 3 2022 report
Completed
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.
Annual report 2022
Completed
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.
Quarter 4 2022 report
Completed
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.
Interim report 2023
Completed
Annual report 2023
Complete
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.
Annual report 2024
Active
A performance report analysing Bath's air quality, vehicle compliance and traffic volume data from January to December 2024 has been published. You can view or download the 2024 documents here.
- Summary of Bath's Clean Air Zone Annual Report 2024
- Bath's Clean Air Zone Full Annual Report 2024
- Appendix 1: Measuring the impact of Bath’s CAZ
- Appendix 2: Full 2024 annual diffusion tube NO2 data
- Appendix 3: Financial summary of the CAZ
- Infographic summary of Bath's CAZ annual report
We have done our best to make these files suitable for users of assistive technology.
Background data
Press and media enquiries
If you have a media enquiry, please email your questions or requests to our central communications and marketing team.
Warning Some file formats may not be suitable for users of assistive technology.
Request an accessible format
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