The ClearfLo (Clean Air for London) Project is a collaborative scientific project involving several academic institutions in the UK, to set up air pollution monitoring sites alongside meteorological measurements to investigate boundary layer pollution across London.

The ambition of ClearfLo is to provide long-term integrated measurements of the meteorology, composition and particulate loading of London’s urban atmosphere, made at street level and at elevated sites, complemented by modelling to improve predictive capability for air quality.

ClearfLo is funded by the Natural Environment Research Council (NERC) for three years from Jan 2010, and is coordinated by the National Centre for Atmospheric Science (NCAS).