Air

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This article is about Air. For other uses of the term Air, please see Air (disambiguation).
(CC) Photo: Pascal Lando
Landscape with clear air and and clouds
For more information, see: Earth's atmosphere.

Air is a colorless, odorless and tasteless mixture of gases consisting mostly of nitrogen (N2) and oxygen (O2). It is the part of Earth's atmosphere that humans and all other animals breathe in order to obtain the oxygen needed to sustain life.

The Earth's atmosphere not only contains the air we breathe, it also holds clouds of moisture (water vapor) that become the water we drink. Furthermore, it protects us from meteors and harmful solar radiation and warms the Earth's surface by heat retention. In effect, the atmosphere is an envelope that protects all life on Earth.

The air may contain pollutants that originate from a variety of sources such as our industries and our vehicles, and can directly or indirectly affect our health and the natural environment. These effects may be experienced near the sources of air pollution and some air pollutants may be transported long distances by the wind, even across political boundaries.[1][2][3]

Composition of the atmospheric air

For more information, see: Atmospheric chemistry.
Composition of Dry Air [4]
Gas Concentration
Name Symbol Volume % ppmv
Nitrogen N2 78.084 780,840
Oxygen O2 20.947 209,470
Argon Ar 0.934 9,340
Carbon dioxide CO2 0.033 330
Neon Ne 0.001820 18.20
Helium He 0.000520 5.20
Methane CH4 0.000200 2.00
Krypton Kr 0.000110 1.10
Sulfur dioxide SO2 0.000100 1.00
Hydrogen H2 0.000050 0.50
Nitrous oxide N2O 0.000050 0.50
Xenon Xe 0.000009 0.09
Ozone O3 0.000007 0.07
Nitrogen dioxide NO2 0.000002 0.02
Notes:

-- ppmv = parts per million parts by volume
-- Water vapor varies up to a maximum of 4 volume percent.
-- The total volume percent of the listed gases does not equal
     exactly 100 percent because of rounding of the numbers.

The adjacent table lists the concentration of 14 gases present in filtered dry air. Two of the gases, nitrogen and oxygen make up 99.03 percent of the clean, dry air. The other listed gases total to 0.97 percent.

Note the amounts of greenhouse gases that are present: water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Additional gases (not listed in the table) are also present in very minute amounts.

The atmospheric air is rarely, if ever, dry. Water vapor is nearly always present up to about 4% of the total volume. In the deserts regions, when dry winds are blowing, the water vapor content will be near zero. This climbs to near 3% on extremely hot/humid days. The upper limit of 4% is for tropical climates.

Unfiltered air contains minute amounts of various types of particulate matter derived from sources such as from dust, pollen and spores, sea spray, volcanoes, meteoroids and industrial activities.

The nitrogen cycle

For more information, see: Nitrogen cycle.

The nitrogen in the air is also essential for life on Earth. It is incorporated into amino acids and proteins, and is part of the nucleic acids, such as DNA and RNA. In plants, nitrogen is used in chlorophyll which is essential for photosynthesis and further growth.

However, the free nitrogen in the atmosphere is mostly unusable by plants. It must first be transformed through bacterial conversion processes into forms usable by living organisms. That transformation (referred to as nitrogen fixation) is part the nitrogen cycle which is the circulating flow of nitrogen through the atmosphere, the soil of the Earth's crust and the Earth's water bodies.[5][6]

References

  1. Arya, S. Pal (1998). Air Pollution Meteorology and Dispersion, 1st Edition. Oxford University Press. ISBN 0-19-507398-3. 
  2. Barrat, Rod (2001). Atmospheric Dispersion Modelling, 1st Edition. Earthscan Publications. ISBN 1-85383-642-7. 
  3. Pielke, Roger A. (2001). Mesoscale Modeling, 2nd Edition. Elsevier. ISBN 0-12-554766-8. 
  4. The Atmosphere From the website of the National Oceanic and Atmospheric Administration (NOAA) and the National Weather Service (NWS), Last updated May 5, 2009
  5. The Nitrogen Cycle 2008, Paul Billiet. From the Open Door Web Site , a reference source for both students and teachers.
  6. The Nitrogen Cycle: Nitrogen Transformations in Soil, Water, and Air. From a website page of the National Aeronautics and Space Administration (NASA).