Of the vehicle fleet, diesel commercial vehicles are key contributors to air pollution, accounting for 90% and 80% of the total vehicular emission of RSP and NOx respectively.

• 在各类车辆中，以柴油商业车辆造成的空气污染最为严重，所排放的悬浮粒子和氮氧化物分别约佔全港总车辆排放量90%25及80%25。