Template:Table composition of dry atmosphere

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Composition of dry atmosphere, by volume[▽ note 1][▽ note 2]
Gas (and others) Various[1] CIPM-2007[2] ASHRAE[3] Schlatter[4] ICAO[5] US StdAtm76[6]

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ppmv [▽ note 3] percentage ppmv percentage ppmv percentage ppmv percentage ppmv percentage ppmv percentage
Nitrogen N2 780,800 78.080% 780,848 78.0848% 780,818 78.0818% 780,840 78.084% 780,840 78.084% 780,840 78.084%
Oxygen O2 209,500 20.950% 209,390 20.9390% 209,435 20.9435% 209,460 20.946% 209,476 20.9476% 209,476 20.9476%
Argon Ar 9,340 0.9340% 9,332 0.9332% 9,332 0.9332% 9,340 0.9340% 9,340 0.9340% 9,340 0.9340%
Carbon dioxide CO2 397.8 0.03978% 400 0.0400% 385 0.0385% 384 0.0384% 314 0.0314% 314 0.0314%
Neon Ne 18.18 0.001818% 18.2 0.00182% 18.2 0.00182% 18.18 0.001818% 18.18 0.001818% 18.18 0.001818%
Helium He 5.24 0.000524% 5.2 0.00052% 5.2 0.00052% 5.24 0.000524% 5.24 0.000524% 5.24 0.000524%
Methane CH4 1.81 0.000181% 1.5 0.00015% 1.5 0.00015% 1.774 0.0001774% 2 0.0002% 2 0.0002%
Krypton Kr 1.14 0.000114% 1.1 0.00011% 1.1 0.00011% 1.14 0.000114% 1.14 0.000114% 1.14 0.000114%
Hydrogen H2 0.55 0.000055% 0.5 0.00005% 0.5 0.00005% 0.56 0.000056% 0.5 0.00005% 0.5 0.00005%
Nitrous oxide N2O 0.325 0.0000325% 0.3 0.00003% 0.3 0.00003% 0.320 0.0000320% 0.5 0.00005% - -
Carbon monoxide CO 0.1 0.00001% 0.2 0.00002% 0.2 0.00002% - - - - - -
Xenon Xe 0.09 0.000009% 0.1 0.00001% 0.1 0.00001% 0.09 0.000009% 0.087 0.0000087% 0.087 0.0000087%
Nitrogen dioxide NO2 0.02 0.000002% - - - - - - Up to 0.02 Up to 0.000002% - -
Iodine I2 0.01 0.000001% - - - - - - Up to 0.01 Up to 0.000001% - -
Ammonia NH3 trace trace - - - - - - - -
Sulfur dioxide SO2 trace trace - - - - - - Up to 1.00 Up to 0.0001% - -
Ozone O3 0.02 to 0.07 2 to 7×10−6% - - - - 0.01 to 0.10 1 to 10×10−6% Up to 0.02 to 0.07 [▽ note 4] Up to 2 to 7×10−6% [▽ note 4] - -
Trace to 30 ppm [▽ note 5] — - - - - 2.9 0.00029% - - - - - -
Dry air total air 1,000,000 100.00% 1,000,000 100.00% 1,000,000 100.00% 1,000,000 100.00% 1,000,000 100.00% 1,000,080 100.00%
Not included in above dry atmosphere
Water vapor H2O ~0.25% by mass over full atmosphere, locally 0.001–5% by volume.[7] ~0.25% by mass over full atmosphere, locally 0.001–5% by volume.[7]
▽ notes
  1. ↑ Concentration pertains to the troposphere
  2. ↑ Total values may not add up to exactly 100% due to roundoff and uncertainty.
  3. ↑ ppmv: parts per million by volume. Volume fraction is equal to mole fraction for ideal gas only, see volume (thermodynamics).
  4. ↑ 4.0 4.1 O3 concentration up to 0.07 ppmv (7×10−6%) in summer and up to 0.02 ppmv (2×10−6%) in winter.
  5. ↑ Volumetric composition value adjustment factor (sum of all trace gases, below the CO2, and adjusts for 30 ppmv)
  1. ↑ Partial sources for figures: Base constituents, Nasa earth factsheet, (updated 2014-03). Carbon dioxide, NOAA Earth System Research Laboratory, (updated 2014-03). Methane and Nitrous Oxide, The NOAA Annual greenhouse gas index(AGGI) Greenhouse gas-Figure 2, (updated 2014-03).
  2. ↑ A., Picard, R.S., Davis, M., Gläser and K., Fujii (2008), Revised formula for the density of moist air (CIPM-2007), Metrologia 45 (2008) 149–155 doi:10.1088/0026-1394/45/2/004, pg 151 Table 1
  3. ↑ S. Herrmann, H.-J. Kretzschmar, and D.P. Gatley (2009), ASHRAE RP-1485 Final Report Thermodynamic Properties of Real Moist Air,Dry Air, Steam, Water, and Ice pg 16 Table 2.1 and 2.2
  4. ↑ Thomas W. Schlatter (2009), Atmospheric Composition and Vertical Structure pg 15 Table 2
  5. ↑ ICAO, Manual of the ICAO Standard Atmosphere (extended to 80 kilometres (262 500 feet)), Doc 7488-CD, Third Edition, (1993), ISBN 92-9194-004-6. pg E-x Table B
  6. ↑ U.S. Committee on Extension to the Standard Atmosphere (COESA) (1976) U.S. Standard Atmosphere, 1976 pg 03 Table 3
  7. ↑ 7.0 7.1 Wallace, John M. and Peter V. Hobbs. Atmospheric Science; An Introductory Survey. Elsevier. Second Edition, 2006. ISBN 978-0-12-732951-2. Chapter 1
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