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 [Seven News, Sun 14Mar2004] Channel 7/AAP; Transcoding by RAPS Inc. http://nostack.8m.com/ 2004 Channel 7/AAP Road Tunnel Filters to be Trialed in Sydney; Backflip [Seven News, Sun 14Mar2004] Channel 7/AAP; Transcoding by RAPS Inc. http://nostack.8m.com/ 2004 Channel 7/AAP