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Foresight Intelligent Infrastructure Systems Project Environmental Factors in Future Transport

the main cause for concern about global warming and climate change. Primary air pollutants include carbon monoxide (CO), carbon dioxide, water vapour and un-burnt fuel, hydrocarbons, including volatile and non-volatile organic compounds, oxides of nitrogen, sulphur dioxide (traces), and particulate matter. Pollutants, such as small particles arise not only from the exhaust but also from the road-tyre interface and from the brakes, engine, bodywork and catalytic converters. Some pollutants, such as CO, are relatively stable; others are less so, including nitrous oxide, which, depending on the meteorological conditions, oxidises to nitrogen dioxide (NO 2 ) and reacts with other