Author: Antonio Da Roza

Date: 12/8/10

Carbon monoxide (CO) comes mainly from vehicular emissions, although a small amount of which may also come from incomplete combustion of fuels from factories and power stations. [1]

Emission from road transport is the primary source of carbon monoxide which contributed to 82% of total emissions in 2007. The tightening of vehicle emission standards mentioned above helped reduce carbon monoxide emissions. [2]


  1. ‘Air Quality Objectives Review Public Consultation’, Environmental Protection Department Hong Kong, July 2009 - last accessed 5/8/10
  2. ‘Air pollutant emission inventory’, EPD website – last accessed 12/8/10