Emissions control systems for today’s air quality standards

NOx Emissions:

Nitrogen oxides (NOx) are formed when nitrogen (N2) and oxygen (O2) are combined at high temperatures and pressure during the combustion of fuel. All fuels, such as gasoline, diesel, biodiesel, propane, coal, and ethanol, emit NOx when burned.

The EPA estimates that 49% of NOx emissions come from on-road and off-road vehicles, 27% from power generation (electric utilities) and the remaining 24% from industrial, commercial and residential sources.

Due to the many compounds that are a part of NOx (predominantly nitrogen dioxide and nitric oxide), the pollutant contributes to a wide variety of health and environmental problems. NOx is also a main component of ground-level ozone and contributes to global warming.

Since the passage of the Clean Air Act in 1970, all primary air pollutants have decreased - except NOx, which has increased by 10%. Due to its serious health and environmental impact, the reduction of NOx in our atmosphere has now become a major focus in the fight against air pollution.

Click to read the EPA brochure: NOx, How nitrogen oxides affect the way we live and breathe.

Properties of NOx:

• Gas
• Most nitrogen oxides are odorless
• NO2 combined with particulate, appears reddish-brown (smog)

Health Impact of NOx:

• Causes respiratory problems such as asthma, emphysema and bronchitis
• Aggravates existing heart disease
• Damage to lung tissue
• Premature death

Environmental Impact of NOx:

• Component in ground-level ozone and smog
• Contributes to acid rain
• Combines with particles to reduce visibility
• Is a greenhouse gas that contributes to global warming and climate change
• Leads to oxygen depletion in bodies of water, upsets chemical balance to aquatic wildlife, creates acidic lakes and stream
• May contribute to biological mutations

 

 

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