Londoners breathe considerably cleaner air when exercising at weekends, in response to new analysis exhibiting nitrogen dioxide (NO₂) publicity falling by virtually 25% in contrast with weekdays.
The examine, based mostly on over 50,000 out of doors runs, rides and walks logged throughout the capital between March 2024 and August 2025 – seems to disclose that median NO₂ publicity drops from 32 µg/m³ on weekdays to 24 µg/m³ on weekends.
The info has been supplied by know-how agency Air Conscious Labs.
While this weekend discount sits simply beneath the World Well being Group’s short-term air air pollution guideline of 25 µg/m³ for a 24-hour interval, it’s nonetheless dangerously near the really helpful wholesome air values – that are more and more topic to particular person behaviour, in addition to variations because of modifications in site visitors volumes, hotter temperatures and meteorological components like wind course.
Key findings:
- Clear-air weekends: 19 of London’s boroughs fall beneath the WHO NO₂ reference worth at weekends, in contrast with simply 4 on weekdays
- Borough contrasts: Camden data the most important enchancment (-31%), whereas Lambeth noticed the worst weekday ranges (38.1 µg/m³). Merton supplied the cleanest weekend air (17.0 µg/m³).
- Borough outliers: Hounslow (+11%) and Havering (+9%) buck the pattern, with greater weekend NO₂ doubtless linked to airport and hall site visitors.
- If you train issues: The exercises with the bottom publicity are round 5am (18 µg/m³), whereas air pollution publicity peaks near 11pm (40 µg/m³).
- Site visitors-linked influence: Information suggests underlying traffic-linked NO₂ is the dominant driver of publicity between weekdays vs weekends within the capital.
Air air pollution prices the UK £500m every week in sick well being, and throughout 2024 in London alone, 114,000 youngsters have been admitted to A&E with severe respiratory issues – the equal of each seat in Wembley Stadium crammed one and a half instances over.
In contrast to ambient monitoring, AirTrack evaluation displays real-world private publicity from the greater than 50,000 logged actions which have been undertaken within the capital as a part of this examine.
Dr Will Hicks, co-founder, Air Conscious Labs, mentioned:
“Air air pollution stays the most important environmental well being threat of our time, and this proof exhibits it’s not simply background air high quality however particular person behaviour that ends in harmful weekday commuter publicity.
“These findings strengthen the case for focused measures like clean-air zones throughout peak commuting hours and borough-level interventions the place the well being returns are best. However we have to transfer past generic recommendation to real-time, personalised motion if we’re severe about defending Londoners’ well being.
WHO pointers are designed to safeguard well being. Consider publicity like horrible credit card debt: even small quantities come at a value, however the greater the stability, the steeper the penalty. The most secure stability is zero. And simply as monetary debt takes self-discipline to cut back, chopping air air pollution calls for willpower from each people and authorities.”
The findings coincide with the capital being placed on a excessive air air pollution alert through the current scorching temperatures and land simply as London debates clean-air corridors, ULEZ growth and peak-hour interventions.
It has additionally been introduced that Oxford Road is to go car-free for a day on Sunday 21 September – the day earlier than World Automobile Free Day – to display how pedestrianisation may work, if the Mayor of London’s plans go forward.