14Mar2004: Sydney, Australia. The NSW Government now says it will trial air filters in a Sydney tunnel. Cautiously received by resident groups - is the announcement clearing the air or another political smokescreen? Road Tunnel Filters to be Trialed in Sydney; Backflip [National Nine News, Sun 14Mar2004] RAPS Inc. http://nostack.8m.com/ 2004 National Nine News Road Tunnel Filters to be Trialed in Sydney; Backflip [National Nine News, Sun 14Mar2004] RAPS Inc. http://nostack.8m.com/ 2004 National Nine News