The epd awarded a consultancy agreement to ove arup & partners hong kong ltd to undertake a comprehensive study to draw up a new set of air quality objectives ( aqos ) for hong kong and devise a long - term plan for meeting such new aqos 环保署与奥雅纳工程顾问签署顾问合约，为本港进行草拟新的空气质素指标进行全面研究，及订立长远管理计划，达致新的空气质素指标。
Longer term trends in air pollutants show increases in annual average concentrations of no2 , decreases in so2 , and consistently high levels of particulates with both tsps and rsps being close to their respective air quality objectives limits 空气污染物含量的长远趋势显示，二氧化碳的平均浓度会按年上升，二氧化硫浓度则按年下降，而空气的悬浮粒子含量持续处于高水平，悬浮粒子总量及可吸入悬浮粒子更接近空气质素指标的上限。
Air quality assessment 6 . 1 the assessment has considered regional air quality impacts resulting from the changes in road traffic emissions after implementation of the crosslinks project . the assessment has predicted levels of nitrogen dioxide , ozone and respirable suspended particulates and compared these with existing pollution levels and air quality objectives 1本研究已评估在新跨界道路工程计划展开后，道路交通废气排放的转变对区域空气质素所带来的影响，并预测二氧化氮、臭氧和可吸入悬浮粒子的浓度，然后与现时空气污染水平和空气质素指标作一比较。
