Air pollution (particulate matter) sensor readings, generally at half-hour intervals, for various locations, generally road-side, in the City of Liverpool. The sensors are supplied and maintained by Aeternum Innovations. As well as data for a number of sensors that have been installed since late 2021/early 2022 across the city, the data from a new set of sensors along the 10A bus route, installed at the end of 2023, are also available. The 10A bus route is one of the city's busiest and is in the process of being converted to hydrogen bus operation.

The data, which includes temperature and humidity, as well as PM1, PM2.5 and PM10 particulate matter concentration measurements, at generally 15 or 30 minute intervals, is available. The raw data is obtained by Professor Jonny Higham at the School of Environmental Sciences at the University of Liverpool, who has taken a machine learning approach to clean the data, remove or correct obviously faulty data, and make it available via a web portal.