Effects of reduction of NOx on the NO2 levels in urban streets

摘要: Nitrogen dioxide is a major problem in urban areas. Persons suffering from respiratory diseases, especially asthma patients, are sensitive to NO 2 at high concentrations. oxide emissions private cars have decreased due the introduction of catalysts. However, catalyst technique today limited petrol vehicles. Since heavy diesel vehicles, e.g. buses, contribute significantly x emissions, this will limit reduction many streets. Another factor continued increase car fleet all countries. Most traffic emitted as NO, which thought be harmless. rapidly transformed by reaction with ozone air. Tropospheric levels been increasing Europe for years consequence pollution. Ozone Danish streets seen limiting production . Thereby O 3 also In paper above supported both observations air quality measurement programmes and model simulations Operational Street Pollution Model.