The Met Office Atmospheric Survey Aircraft (MOASA) Clean Air project collected air pollution data over the UK between August 2019 to April 2022. During this time 60 flights were made (totalling over 153 hours of atmospheric sampling), across 8 repeatable sorties including two intensive data collection periods, one in summer and one in winter, flying upwind and downwind of the the Natural Environment Research Council (NERC) ‘supersites’ in London, Manchester and Birmingham and circling over them at various altitudes.

The aircraft was equipped with with air monitoring instrumentation to observe the three-dimensional distribution of pollutants (gaseous nitrogen dioxide, ozone, sulphur dioxide and fine mode (PM2.5) aerosol).

This project was part of the Strategic Priorities Fund (SPF) Clean Air Programme, delivered by UKRI.