Air pollution in Glasgow city centre has dropped by a third since enforcement of the Low Emission Zone – marking a major step forward in the city’s clean air ambitions.
New data for 2024 shows a 34% reduction in levels of nitrogen dioxide within the LEZ area compared to 2022 – the last full year before scheme enforcement. Diffusion tube monitoring has also shown a 21% drop of the harmful pollutant at locations outside the zone.
This clean air breakthrough is detailed in Glasgow’s most recent Air Quality Annual Progress Report — the first to reflect a full calendar year of data since the city centre Low Emission Zone was extended to all vehicle types in June 2023.
Annual monitoring from 2024 has also shown that for the first time, Glasgow recorded full compliance with all statutory air quality objectives following their introduction thirty years ago.
These latest results highlight the effectiveness of Glasgow’s LEZ in improving air quality citywide, representing a significant step forward in the city’s commitment to reducing pollution and safeguarding public health.
Levels of nitrogen dioxide at all automatic monitoring stations were below the objective levels, continuing the trend of compliance for the third consecutive year. While Hope Street – known for recording the highest nitrogen dioxide levels in Scotland – is now reporting concentrations nearly 10% below the statutory objective, illustrating the transformative impact of Glasgow’s clean air measures.
City centre diffusion tubes, which in 2023 recorded levels of nitrogen dioxide above the objective on Gordon Street and under the Hielanman’s Umbrella are now in full compliance – with the highest recorded level more than 25% below the objective.
And building on several years of consistent compliance, the annual objectives for PM10 and PM2.5 – the ultra-fine particles known to pose serious health risks, were successfully met at all monitoring locations.
Cllr Angus Millar, Convener for Transport, Climate and City Centre Recovery said: “These new figures clearly show that Glasgow’s Low Emission Zone is successfully tackling city centre air pollution. A one-third drop in levels of harmful nitrogen dioxide since the LEZ’s introduction means cleaner air for everyone.
“Air pollution contributes to hundreds of deaths in Glasgow every year and damages the health of thousands more. The LEZ was introduced to tackle the stubbornly high pollution levels causing that. Now, for the first time, Glasgow is meeting the legal limits on air pollution at all recorded locations.
“These significant improvements to city centre air quality come at a crucial time, as footfall continues to rise and key streets are transformed through the Avenues programme. Cleaner air not only reduces health risks but helps create a more pleasant environment for everyone.”
Cabinet Secretary for Transport Fiona Hyslop said: “I’m very pleased that Glasgow’s Low Emission Zone is significantly improving local air quality. What we’re seeing through these findings is a clear and direct link between the LEZ and air quality benefits. Glasgow was the first LEZ in Scotland to start enforcement and the first to deliver these benefits. We can expect to see similar reductions across Aberdeen, Dundee and Edinburgh in time.
“We know that air pollution disproportionately impacts the youngest, the oldest and those with pre-existing medical conditions. As such, the LEZ is working effectively to protect public health in Glasgow and reduce health inequalities.
“At the same time – it’s really encouraging that the revenue raised from the LEZ has been reinvested to support local community projects that work to protect the climate and further improve air quality across the city.”
Glasgow has previously declared four Air Quality Management Areas (AQMAs) due to levels of nitrogen dioxide and particulate matter exceeding the legal objectives.
Three of these AQMAs have since been revoked, reflecting ongoing improvements in air quality. However, the AQMA for the city centre, established in 2002, remains in place.
Whilst the LEZ is driving significant improvements in the city centre’s air quality, revocation of an AQMA can only happen where there is compliance with the objectives for at least three consecutive years, and where further exceedances of the objectives are unlikely to occur.
If current progress continues, the city centre AQMA will be eligible for revocation ahead of the 2029 target set in Glasgow’s 2024 Air Quality Action Plan.