Ground based in situ observations of aerosol_light_scattering_coefficient at Sable Island (CA0101R) using nephelometer. These measurements are gathered as a part of the following projects NOAA-ESRL, GAW-WDCA and they are stored in the EBAS database (http://ebas.nilu.no/). Parameters measured are: aerosol_light_scattering_coefficient in pm10