One year on from Bristol implementing the Clean Air Zone, the Joint Air Quality Unit (JAQU) has produced their first interim report on the zone.
Findings suggest that clean air is being delivered in Bristol, with data indicating that air quality in the city will not exceed the Government’s average annual legal limit this year.
How Bristol’s Clean Air Zone is being assessed
The council monitors air pollution via diffusion tubes at just under 200 locations throughout the city, both inside and outside Bristol’s Clean Air Zone. A diffusion tube is a scientific device that samples the concentration of gases in the air. They are used to monitor average air pollution levels across Bristol. There are four different stages for the Government to determine if a Local Authority is achieving success.
State 1 – on track to achieve success
State 2 – has achieved success
State 3 – demonstrated to be maintaining success with measures
State 4 – likely to continue maintaining success in the absence of measures
Success is defined by national government and means that the measures put in place, for example Bristol’s Clean Air Zone, is having the desired effect and further air pollution will not exceed the annual average legal limit.
The purpose of this technical report from JAQU, known as a State 1 report, is to assess whether a Local Authority is on track to achieve success by the end of the calendar year. The report assesses Bristol’s air quality data from diffusion tubes and provides transport data analysis from the first six months of the 2023 calendar year. This data provides a representative average period for the in-year assessment.
Bristol’s data forecasts that the Clean Air Zone is having a positive impact on air quality. Data indicates that further NO2 concentrates will not exceed the Government’s average annual legal limit. This means that Bristol’s State 1 assessment is successful and JAQU recommend progressing to State 2.
The diffusion tubes must be analysed in a laboratory, which takes on average four – five weeks. Due to this processing time, a full 12-month report with operational data (air quality and financial) will be published as part of papers for January’s Cabinet meeting, alongside JAQU’s State 1 report.
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