Introduction
London has one of the most comprehensive air quality monitoring systems in the world, measuring pollution through a variety of methods – from high-precision reference monitoring stations, to diffusion tubes that track long-term trends, to the Breathe London network, the Mayor’s pioneering air quality monitoring network providing detailed, street-level data across the capital. A complementary element of this is Breathe London Communities – delivered by Imperial College London as part of the wider Breathe London initiative.
Our air quality dashboard consolidates all of this information into a single, easy-to-use platform, enabling Londoners to explore detailed air quality data for their local area and across the city.
The dashboard includes the following datasets:
Reference data
High-accuracy air quality monitoring stations owned and operated by London's boroughs, often providing hourly measurements of nitrogen dioxide (NO₂) and particulate matter (PM2.5 and/or PM10). This is taken from the London Air Quality Network and Air Quality England.
Breathe London and Breathe London Communities
A London-wide network of low-cost sensors, supported by a complementary community-led network, integrated with the reference network to enhance data quality and accuracy, providing open-access hourly averages for nitrogen dioxide (NO₂) and fine particulate matter (PM2.5).
NO₂ diffusion tubes
Small, passive samplers which measure the concentration of nitrogen dioxide (NO₂) in the air at a certain location, providing a monthly average measurement. The diffusion tubes supplement the existing network of more accurate reference analysers across London.
Explore London's air quality
Switch to the dashboard to examine the data
- Nearly 4,000 monitor locations
- Multiple air quality networks
- Data from 2021 - 2025
