Template:Table composition of dry atmosphere

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]		▼ Tap to expand or collapse table ▲
Gas (and others)		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 ^ Concentration pertains to the troposphere ^ Total values may not add up to exactly 100% due to roundoff and uncertainty. ^ ppmv: parts per million by volume. Volume fraction is equal to mole fraction for ideal gas only, see volume (thermodynamics). ^ ^a ^b O₃ concentration up to 0.07 ppmv (7×10⁻⁶%) in summer and up to 0.02 ppmv (2×10⁻⁶%) in winter. ^ Volumetric composition value adjustment factor (sum of all trace gases, below the CO₂, and adjusts for 30 ppmv)

^ 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).
^ 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
^ 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
^ Thomas W. Schlatter (2009), Atmospheric Composition and Vertical Structure pg 15 Table 2
^ 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
^ U.S. Committee on Extension to the Standard Atmosphere (COESA) (1976) U.S. Standard Atmosphere, 1976 pg 03 Table 3
^ ^a ^b Wallace, John M. and Peter V. Hobbs. Atmospheric Science; An Introductory Survey. Elsevier. Second Edition, 2006. ISBN 978-0-12-732951-2. Chapter 1

[refname1-1] Concentration pertains to the troposphere

[refname2-2] Total values may not add up to exactly 100% due to roundoff and uncertainty.

[refname3-9] v: parts per million by volume. Volume fraction is equal to mole fraction for ideal gas only, see volume (thermodynamics).

[refname6-10] O₃ concentration up to 0.07 ppmv (7×10⁻⁶%) in summer and up to 0.02 ppmv (2×10⁻⁶%) in winter.

[refname5-11] Volumetric composition value adjustment factor (sum of all trace gases, below the CO₂, and adjusts for 30 ppmv)

[3] 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).

[4] 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

[5] 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

[6] Thomas W. Schlatter (2009), Atmospheric Composition and Vertical Structure pg 15 Table 2

[7] 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

[8] U.S. Committee on Extension to the Standard Atmosphere (COESA) (1976) U.S. Standard Atmosphere, 1976 pg 03 Table 3

[WallaceHobbs-12] 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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