THIRTY-SIX representatives of local authorities and other organisations co-operating with the Department of Scientific and Industrial Research in the investigation of atmospheric pollution met on May 27 in the half yearly conference on atmospheric pollution at the offices of the Department. A report was received from Dr. G. M. B. Dobson on the progress of the researches carried out under the Atmospheric Pollution Research Committee. Dr. Dobson informed the conference that a full-time investigator has been appointed by the Department as a preliminary to the undertaking of an intensive survey, at a selected centre, of various types of pollution with a larger number of instruments. The method developed at the Building Research Station for estimating sulphur in the atmosphere is now being adopted more widely by the local authorities. Further experiments combined with weather observations are being taken in hand to facilitate the interpretation of the data collected by means of the deposit gauge observations.