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Nitrogen Dioxide (NO2): Health Effects & Limits

Nitrogen dioxide (NO2) is a toxic irritant gas produced mainly by combustion processes that can damage the airways and lungs.

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Things worth knowing about "Nitrogen dioxide"

Nitrogen dioxide (NO2) is a toxic irritant gas produced mainly by combustion processes that can damage the airways and lungs.

What is Nitrogen Dioxide?

Nitrogen dioxide (chemical formula: NO2) is a reddish-brown, pungent-smelling irritant gas belonging to the group of nitrogen oxides. It is produced mainly during the combustion of fossil fuels in motor vehicles, power plants, and heating systems. Nitrogen dioxide is a major air pollutant and poses significant risks to human health and the environment.

Sources and Formation

NO2 is formed primarily through the oxidation of nitric oxide (NO), which is released during high-temperature combustion processes. The main sources include:

Road traffic: Diesel and petrol vehicles are the primary sources in urban areas.
Industry and power plants: Combustion facilities and industrial processes release large amounts of nitrogen oxides.
Heating systems: Gas and oil boilers can contribute to indoor NO2 levels.
Tobacco smoke: Smoking significantly increases NO2 concentrations indoors.

Health Effects

Nitrogen dioxide acts as a potent irritant to mucous membranes and the respiratory tract. The health consequences depend strongly on the concentration and duration of exposure.

Short-term Effects

Irritation of the eyes, nose, and throat
Coughing and shortness of breath
Worsening of asthma and other respiratory conditions
At very high concentrations: lung damage and pulmonary oedema

Long-term Effects

Chronic inflammation of the airways
Increased risk of developing bronchial asthma
Reduced lung function, especially in children
Increased risk of cardiovascular disease

Limit Values and Regulation

The World Health Organization (WHO) has established guidelines for NO2 levels in the air to protect public health. The recommended annual mean value was lowered in the 2021 WHO Air Quality Guidelines to 10 µg/m³ (previously 40 µg/m³). In the European Union, the current legal annual mean limit is 40 µg/m³, with plans to tighten this standard progressively.

Environmental Impact

In addition to health effects, NO2 has significant environmental consequences:

Ground-level ozone formation: Nitrogen dioxide contributes to the formation of ground-level ozone, which harms plants and humans.
Acid rain: NO2 reacts with water in the atmosphere to form nitric acid, contributing to acid rain.
Secondary particulate matter: Nitrogen oxides contribute to the formation of fine particulate matter (PM2.5).

Protective Measures

To reduce personal exposure to nitrogen dioxide, the following measures are recommended:

Use of low-emission transport or public transit
Regular ventilation of indoor spaces, but not during peak traffic hours near busy roads
Use of air purifiers with HEPA filters in heavily polluted areas
Avoidance of tobacco smoke indoors

Medical Treatment Following Exposure

In the event of acute poisoning or severe irritation caused by nitrogen dioxide, affected individuals should immediately move to fresh air and seek medical attention. In severe cases, hospital treatment may be required, including supplemental oxygen, bronchodilators, and monitoring of lung function.

References

World Health Organization (WHO): WHO Global Air Quality Guidelines. Particulate matter (PM2.5 and PM10), ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide. Geneva, 2021.
European Environment Agency (EEA): Air quality in Europe – 2022 report. Copenhagen, 2022.
German Federal Environment Agency (Umweltbundesamt): Nitrogen Dioxide (NO2) – Health and Environmental Effects. Dessau-Roßlau, 2023.

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