There are plans to establish four more air quality monitoring stations including one more at the roadside. Monitoring of toxic air pollutants at Tsuen Wan and Western District commenced in 1997.

• 当局计划增设4个空气质素监测站，包括多设1个路旁空气质素监测站，而监测荃湾及西区有毒空气污染物含量的工作已在一九九七年展开。