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Author Topic: Nitrogen Oxides (NOx), net Ozone Depletion or Formation?  (Read 7217 times)

Offline CliffordK

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I had read earlier that Nitrogen Oxides (NOx), and in particular Nitrogen Oxide (NO) and Nitrogen dioxide (NO2) are important in the formation of Ozone.

http://en.wikipedia.org/wiki/Nitrogen_oxide

    NO + CH3O2 → NO2 + CH3O
    NO2 + sunlight → NO + O

However, I'm also seeing that Nitrous Oxide (N2O) causes ozone depletion.

http://www.sciencedaily.com/releases/2009/08/090827141344.htm

Since there is typically a mix of nitrogen oxides formed in combustion, is there actually a net increase or decrease in Ozone, or does it make a difference?


 

Offline yor_on

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Nitrogen Oxides (NOx), net Ozone Depletion or Formation?
« Reply #1 on: 04/02/2011 14:54:51 »
"Ozone is a form of oxygen that consists of three chemically bonded oxygen atoms (O3) instead of the normal atmospheric oxygen, which consists of two oxygen atoms (O2). Ozone  is formed by the reaction of an oxygen atom with an oxygen molecule. Oxygen molecules are formed by electrical discharges and/or certain types of radiation such as ultraviolet light in the air.

2. What is the difference between good ozone and bad ozone?

The difference between good ozone and bad ozone depends on which layer of the earth's atmosphere the ozone is found. Good ozone, or stratospheric ozone, is found in the stratospheric layer of the atmosphere. The stratospheric layer reaches from ten to thirty-one miles above the earth's surface. Within this layer, good ozone is made and destroyed naturally all of the time. The layer of stratospheric ozone varies in thickness for this very reason. Stratospheric ozone acts as a filter and absorbs the sun's ultraviolet rays, therefore, warming the atmosphere and filtering out harmful ultraviolet radiation from reaching the earth.

Bad ozone, or ground-level ozone, is found in the tropospheric layer, which is about 10 miles thick, from the ground up (also known as ambient air). Ground-level ozone is composed of natural atmospheric gases, volatile organic compounds (VOCs), nitrogen oxides, and sunlight. Ground-level ozone levels are usually higher on hot, sunny days. Cars produce most of the nitrogen oxides and VOCs, so times of increased vehicle use also increases the amount of ozone in the troposphere. Ground-level ozone is one of the "criteria pollutants," those that are most prevalent in the ambient air."

Some answers can be found here. They also take up Nitrogen Oxides. As for Ozone Chemistry in the atmosphere. This one seems nice.
 

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Nitrogen Oxides (NOx), net Ozone Depletion or Formation?
« Reply #1 on: 04/02/2011 14:54:51 »

 

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