NOx - Nitrogen oxides

NOx is a generic term for the mono-nitrogen oxides NO and NO2 (nitric oxide and nitrogen dioxide). They are produced from the reaction of nitrogen and oxygen gases in the air during combustion, especially at high temperatures.

NOx is highly reactive and forms a wide variety of toxic products. NOx and its derivatives can penetrate deeply into sensitive lung tissue, causing or worsening respiratory diseases such as emphysema or bronchitis. Aggravation of existing heart disease and premature death can in extreme cases also be attributed to these substances.

In the presence of sunlight NOx reacts with volatile organic compounds to form Ozone which can also cause adverse effects to lung tissue mostly in susceptible populations (children, elderly, asthmatics). Ozone can be transported by wind currents and cause health impacts far from the original sources.

Even though this list is non-exhaustive it becomes obvious that NOx is extremely harmful and that its emission should be avoided what ever it takes.


90% of NOx is NO

Unless NO is eliminated, it will transform to the much more toxic NO2.


5% - 10% of NOx is NO2

NO2 is classified to be toxic. It has a characteristic odor like chlorine.