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Bath's Clean Air Zone monitoring reports

Published: 2021-09-09 Updated: 2021-09-09 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 Oxide (NO2) concentrations to within the annual mean limit of 40 μg/m3 by the end of 2021 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
  2. 2. Cabinet decision to introduce a Class C Clean Air Zone

    Completed Spring 2019
  3. Launch of financial assistance scheme

    Completed Autumn 2020
  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


    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
    • Cabinet report on Bath's Clean Air Zone - September 2021
    • Appendix 1 - Measuring the impact of the CAZ reporting timeline
    • Appendix 2 - Investigating concerns of traffic displacement

    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

    On target Winter 2021

    This will cover the period from July to September 2021

  8. Quarter 4 2021 report

    On target Spring 2022

    This will cover the period from October to December 2021

  9. Annual report

    On target Summer 2022

    This will cover the period from January to December 2021, and will draw together monthly data that indicates whether we have met our air quality target in line with government direction.

Press and media enquiries

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