In conclusion, the atmospheric chemistry of nitrogen compounds is complex and in

urban areas, is also dependent on the presence of other pollutants, such as

hydrocarbons, and on meteorology. Effects will also differ with differing climate.

There is no linear relationship between emissions of NOx and concentrations of NO2.

As a result, it is difficult to quantify the emission reduction needed to reduce NO2

concentration to any given level.

 

 

 

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