Measurements of air pollution collected with novel sensing technologies that now offer the potential to monitor detailed personal exposure during daily life at population scale, thanks to their significantly reduced cost, smaller size and fast-response: This data was collected with a state-of-the-art personal air quality monitor (PAM) and aims to characterise the performance of this specific configuration with currently available sensor variants for specific environmental conditions, as a necessary precursor to a series of papers on exposure and health impacts using these PAMs. More specifically, the PAM has already been deployed to participants of two large cardio-pulmonary cohorts in China AIRLESS- Theme 3 APHH project) and the UK (COPE) and in a number of smaller international pilot projects. This dataset was collected to assess the performance of the PAM sensors in well-characterised outdoor, indoor and commuting microenvironments across seasons and diverse environments. Measurements of gaseous pollutants were collected with commercially available electrochemical sensors and measurements of particulate matter have been collected with a miniaturised optical particle counter. See the README file for a detailed description of each data file.