Patent ID: 6511258
Filing Date: 2003-01-28
Classification: B03C,E01C

Abstract:
A method for controlling the concentration of charged ionised gas and/or particles over roads, street, or open spaces, characterized in that an electrical field is established between the said ionised gas and/or particles and an open, essentially stationary surface (1; 11) over such roads, streets, or open spaces, and/or over open, essentially stationary surfaces in the vicinity of such roads, street or open spaces, by charging electrically or giving a negative electrical potential to at least the top layer of said surface (1; 11), and that this electrically charged top layer is connected to earth or to one pole of a voltage source (7) whose other pole is connected to earth, with the result that the said ionised gas and particles will be attracted to or repelled from the surface (1;11).