The 2012 Air Pollution Control (Vehicle Design Standards) amendment regulation was released here Friday to tighten emission standards for newly registered vehicles to European levels, according to the Hong Kong government website.

The city's Environmental Protection Department said the regulation requires newly registered vehicles to comply with Euro V standards from June 1. Newly registered diesel vehicles of less than 3.5 tons must comply with the standards from Dec. 31.

Compared with Euro IV vehicles, Euro V heavy diesel vehicles emit 40 percent less nitrogen oxide, while light diesel vehicles emit 80 percent less respirable suspended particulates and 30 percent less nitrogen oxide. Euro V petrol or LPG vehicles emit 30 percent less nitrogen oxide.

The amendment will be tabled at the Legislative Council on March 28. If approved, it will take effect on June 1, 2012.