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 on behalf of CDRC and the University of Liverpool. Each sensor has been professionally installed and calibrated by them. 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 a linear bus route, the 10A, which were 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 pre-existing sensors have good spatial coverage across Liverpool, but with a focus on the city centre.

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 cleaned the raw data, to fit it in to the regular time intervals, also removing or correcting obviously faulty data, and making it available via a web portal.

The data is in the form of one CSV file for each sensor and time period (historic to end of 2023 and quarterly onwards), and one metadata file with locations, names and IDs for each sensor. The sensors were commissioned by CDRC. With special thanks to Jonny Higham for data cleaning and preparation. The temporal granularity is typically every 30 minutes, normally every 15-60 minutes, some prolonged data gaps. Variables include date and time, temperature, humidity, PM1.0, PM2.5 and PM10.