In recent years, a number of studies have established the link between poor air quality and health in urban areas. Road, air and rail transport, shipping, domestic, commercial heating, industry and power generation all generate polluting emissions; while natural sources including wind-blown sea salt, sand or soil also contribute to air pollution levels.
Last year the Mayor announced his ambition for London, ‘Vision 2020’, which included meeting strict European Union limits for air pollutants. This is a challenge for London’s transport network, recent modelling has indicated approximately half the emissions of most concern are from rail and road transport. That proportion is even greater in central London, where human exposure is also at its highest.
 NOx and PM10 taken from the London Atmospheric Emissions Inventory
NO2 Annual Mean in 2020
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