What Are Greenhouse Gases (GHG) and How Do They Compare to Nitrogen Oxides (NOx)?

Both nitrogen oxides (NOx) and greenhouse gases (GHG) pose serious threats, although at different scales and through distinct mechanisms.

Greenhouse Gases (GHG) 

Are those that trap heat in the Earth’s atmosphere by absorbing infrared radiation that would otherwise escape into space. This process, known as the natural greenhouse effect, is essential for maintaining suitable temperatures on the planet. However, when their concentration increases due to human activities, global warming intensifies, leading to significant impacts on climate, health, and the economy (US EPA+1).+

Greenhouse gases are natural and necessary for life, but the excess generated by human activity is intensifying climate change.

The most important GHG include:

• Carbon dioxide (CO₂): Released mainly through the burning of fossil fuels, deforestation, and certain industrial processes. Although natural mechanisms (such as plants and oceans) absorb it, human emissions have disrupted this balance (US EPA) .

It is the primary gas responsible for climate change due to the sheer volume of its emissions.

• Methane (CH₄): Originates from activities such as coal mining, natural gas extraction and transport, landfills, and livestock, as well as natural sources like wetlands (US EPA).

It heats the atmosphere much more quickly than CO₂ (up to 28 times more over 100 years).

• Nitrous oxide (N₂O): Its main sources include agriculture (fertilizer use) and the burning of fossil fuels (US EPA).

 It also occurs naturally in nitrogen cycle processes, mainly due to bacteria in soils and oceans.

• Synthetic gases such as HFCs, PFCs, SF₆: Used in refrigeration, air conditioning, and industrial processes, these gases have a global warming potential (GWP) much higher than CO₂, although they are emitted in smaller quantities  (US EPA).

Advantages: Allow Earth to maintain a habitable temperature.

Disadvantages (when concentrations increase): Cause changes in climate patterns, heat waves, droughts, rising sea levels, and impacts on health, agriculture, infrastructure, and ecosystems (US EPAEPA+1).

Nitrogen Oxides (NOx)

On the other hand, nitrogen oxides (NOx) a group consisting of nitric oxide (NO) and nitrogen dioxide (NO₂), are produced mainly during the combustion of fossil fuels at high temperatures, such as in vehicles, ships, or boilers (Nitrogen oxides, NOx — European Environment Agency).

Impacts on health and ecosystems:

• Smog and ground-level ozone formation: NOx reacts with volatile organic compounds under sunlight, forming harmful ozone and smog.
  
  
• Acid rain: Produces acids that damage soils, water, and vegetation.
  
  
• Health effects: Exposure to NOx can cause respiratory irritation, worsen asthma, damage lungs, and even contribute to heart disease or cancer.
  

Conclusion

DEF(AdBlue) Noxguard

The burning of fossil fuels is one of the main sources of both pollutants. For Noxguard, it is essential to promote energy transition policies and sustainable mobility. Our goal is clear: to support the reduction of pollutant emissions through the use of high-purity DEF (AdBlue), used in diesel-powered trucks equipped with SCR (Selective Catalytic Reduction) systems. Working together, these technologies help reduce up to 98% of NOx (nitrogen oxides) generated during diesel combustion.

In this way, we not only contribute to protecting health and air quality but also improve the operational efficiency of your fleet, fostering a more sustainable and responsible economy.