Outdated vehicles degrade urban air quality

Outdated Vehicles Degrade Urban Air Quality
Percentage of Emissions in Selected Chinese Cities Attributable to Motor Vehicles
�	PERCENTAGE ATTRIBUTABLE TO MOTOR VEHICLES
�	CARBON MONOXIDE	HYDROCARBONS	NITROUS OXIDES	CATEGORIES
Beijing	48-64	60-74	10-22	District
Shanghai	69	37	�	District
Shenyang	27-38	�	45-53	District
Jinan	28	�	4-6	District
Hangzhou	24-70	�	�	Road
Urumqi	12-50	�	�	Road
Guangzhou	70	�	43	�
Source: He et al., “Status and Development of Vehicular Pollution in China,” Environmental Science, Vol. 7, No. 4 (August 1996).