List of highly toxic gases - AbsoluteAstronomy.com

Definition

A compressed gas or vapor that has a median lethal concentration (LC50) in air of 200 parts per million (ppm) by volume, or 2 milligrams per liter of mist, fume, or dust, when administered by continuous inhalation for one hour (or less if death occurs within one hour) to albino rats weighing between 200 and 300 grams each.

A NFPA 704
NFPA 704
NFPA 704 is a standard maintained by the U.S.-based National Fire Protection Association. It defines the colloquial "fire diamond" used by emergency personnel to quickly and easily identify the risks posed by nearby hazardous materials...

Health Hazard rating of 3 is given to vapors having an LC50 from 2 to 10 mg/l.

Globally Harmonized System of Classification and Labelling of Chemicals – Part 3, Health Hazards; United Nations
United Nations
The United Nations is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace...

, 2007

- Inhalation – Gases

Category 1: LC50 ≤ 100 ppm by Volume

Category 2: LC50 ≤ 500 ppm by Volume

Category 3: LC50 ≤ 2,500 ppm by Volume

Category 4: LC50 ≤ 20,000 ppm by Volume

Category 5: not defined though is expected to have an equivalent of category 5 oral and dermal

- Inhalation – Vapours

Category 1: LC50 ≤ 0.5 mg/l

Category 2: LC50 ≤ 2.0 mg/l

Category 3: LC50 ≤ 10 mg/l

Category 4: LC50 ≤ 20 mg/l

Category 5: not defined though is expected to have an equivalent of category 5 oral and dermal

- Inhalation – Dust and Mists

Category 1: LC50 ≤ 0.05 mg/l

Category 2: LC50 ≤ 0.5 mg/l

Category 3: LC50 ≤ 1.0 mg/l

Category 4: LC50 ≤ 5 mg/l

Category 5: not defined though is expected to have an equivalent of category 5 oral and dermal

List

Chemical name	Chemical formula	CAS number	NIOSH IDLH IDLH IDLH is an initialism for Immediately Dangerous to Life or Health, and is defined by the US National Institute for Occupational Safety and Health as exposure to airborne contaminants that is "likely to cause death or immediate or delayed permanent adverse health effects or prevent escape from such... in ppm	LC50 Model	LC50 toxicity in ppm unless noted as occupational exposure limits. ACGIH Threshold Limit Value Threshold Limit Value The threshold limit value of a chemical substance is a level to which it is believed a worker can be exposed day after day for a working lifetime without adverse health effects. Strictly speaking, TLV is a reserved term of the American Conference of Governmental Industrial Hygienists... s are listed with documentation date.	Odor warning property	NFPA 704 Health Rating
Arsenic pentafluoride Arsenic pentafluoride Arsenic pentafluoride is a chemical compound of arsenic and fluorine. The oxidation state of arsenic is +5.-Synthesis:Arsenic pentafluoride can be prepared by direct combination of arsenic and fluorine:...	AsF₅	7784-36-3		Rat	20	inadequate	4
Arsine Arsine Arsine is the chemical compound with the formula AsH3. This flammable, pyrophoric, and highly toxic gas is one of the simplest compounds of arsenic...	AsH₃	7784-42-1	3	Rat	20; ACGIH (2006) TWA Twa The Twa are any of several hunting peoples of Africa who live interdependently with agricultural Bantu populations, and generally hold a socially subordinate position: They provide the farming population with game in exchange for agricultural products.... -TLV 0.005ppm		4
Bis(trifluoromethyl)peroxide	C₂F₆O₂	927-84-4	10	Rat
Boron tribromide Boron tribromide Boron tribromide, BBr3, is a colorless, fuming liquid compound containing boron and bromine. It is usually made by heating boron trioxide with carbon in the presence of bromine: this generates free boron which reacts vigorously with the bromine...	BBr₃	10294-33-4	50	Rat	380; ACGIH (1990) Ceiling limit 1ppm		3
Boron trichloride Boron trichloride Boron trichloride is a chemical compound with the formula BCl3. This colorless gas is a valuable reagent in organic synthesis. It is also dangerously reactive.-Production and properties:Boron reacts with halogens to give the corresponding trihalides...	BCl₃	10294-34-5	25	Rat	2541		4
Boron trifluoride Boron trifluoride Boron trifluoride is the chemical compound with the formula BF3. This pungent colourless toxic gas forms white fumes in moist air. It is a useful Lewis acid and a versatile building block for other boron compounds.-Structure and bonding:...	BF₃	7637-07-2	25		OSHA, ACGIH (1962) 1ppm ceiling
Bromine Bromine Bromine ") is a chemical element with the symbol Br, an atomic number of 35, and an atomic mass of 79.904. It is in the halogen element group. The element was isolated independently by two chemists, Carl Jacob Löwig and Antoine Jerome Balard, in 1825–1826...	Br₂	7726-95-6	3		ACGIH (1991) Short-Term Exposure Limit Short-term exposure limit The short-term exposure limit is a term used in occupational health, industrial hygiene and toxicology. The STEL may be a legal limit in the United States for exposure of an employee to a chemical substance. The Occupational Safety and Health Administration has set OSHA-STELs for 1,3-Butadiene,... STEL-TLV 0.2ppm		4
Bromine chloride	BrCl	13863-41-7		Rat	290
Bromomethane	CH₃Br	74-83-9		Rat	811.14		3
Carbon monoxide Carbon monoxide Carbon monoxide , also called carbonous oxide, is a colorless, odorless, and tasteless gas that is slightly lighter than air. It is highly toxic to humans and animals in higher quantities, although it is also produced in normal animal metabolism in low quantities, and is thought to have some normal...	CO	630-08-0	1,200 (moderately toxic)		ACGIH (1989) TWA TLV 25ppm; NIOSH 35ppm; NIOSH 200ppm Ceiling limit		4
Chlorine Chlorine Chlorine is the chemical element with atomic number 17 and symbol Cl. It is the second lightest halogen, found in the periodic table in group 17. The element forms diatomic molecules under standard conditions, called dichlorine...	Cl₂	7782-50-5	10		ACGIH (1986) STEL-TLV 1ppm	Odor threshold 1ppm
Chlorine pentafluoride Chlorine pentafluoride Chlorine pentafluoride is an interhalogen compound with formula ClF5. It was first synthesized in 1963.Its square pyramidal structure with C4v symmetry was confirmed by its high resolution19F NMR spectrum.-Preparation:...	ClF₅	13637-63-3
Chlorine trifluoride Chlorine trifluoride Chlorine trifluoride is an interhalogen compound with the formula ClF3. This colourless, poisonous, corrosive and very reactive gas condenses to a pale-greenish yellow liquid, the form in which it is most often sold...	ClF₃	7790-91-2			ACGIH (1979) Ceiling limit 0.1ppm	inadequate	4
Chloropicrin Chloropicrin Chloropicrin, also known as PS, is a chemical compound with the structural formula Cl3CNO2. This colourless highly toxic liquid was once used in chemical warfare and is currently used as a fumigant and nematocide.-History:...	CCl₃NO₂	76-06-2			ACGIH (1990) TWA-TLV 0.1ppm
Cyanogen Cyanogen Cyanogen is the chemical compound with the formula 2. It is a colorless, toxic gas with a pungent odor.The molecule is a pseudohalogen. Cyanogen molecules consist of two CN groups — analogous to diatomic halogen molecules, such as Cl2, but far less oxidizing...	C₂N₂	460-19-5		Rat	350; ACGIH (1966) TWA-TLV 10ppm	inadequate	4
Cyanogen chloride Cyanogen chloride Cyanogen chloride is an inorganic compound with the formula NCCl. This linear, triatomic pseudohalogen is an easily condensed colorless gas. More commonly encountered in the laboratory is the related compound cyanogen bromide, a room-temperature solid that is widely used in biochemical analysis and...	CNCl	506-77-4		Rat	1.2 mg/l/h; ACGIH (1977) ceiling limit 0.3ppm	inadequate	4
Diazomethane Diazomethane Diazomethane is the chemical compound CH2N2. It is the simplest of diazo compounds. In the pure form at room temperature, it is a extremely sensitive explosive yellow gas, thus it is almost universally used as a solution in diethyl ether...	CH₂N₂	334-88-3	2		ACGIH (1970) TWA-TLV 0.2ppm
Diborane Diborane Diborane is the chemical compound consisting of boron and hydrogen with the formula B2H6. It is a colorless gas at room temperature with a repulsively sweet odor. Diborane mixes well with air, easily forming explosive mixtures. Diborane will ignite spontaneously in moist air at room temperature...	B₂H₆	19287-45-7		Rat	80; ACGIH (1990) TWA-TLV 0.1ppm	inadequate	4
Dichloroacetylene	C₂Cl₂	7572-29-4		Mouse	45.6
Dichlorosilane Dichlorosilane Dichlorosilane , or DCS as it is commonly known, is usually mixed with ammonia in LPCVD chambers to grow silicon nitride in semiconductor processing.A higher concentration of DCS:NH3 Dichlorosilane (H2SiCl2), or DCS as it is commonly known, is usually mixed with ammonia (NH3) in LPCVD chambers to...	H₂Cl₂Si	4109-96-0		Rat	314		4
Fluorine Fluorine Fluorine is the chemical element with atomic number 9, represented by the symbol F. It is the lightest element of the halogen column of the periodic table and has a single stable isotope, fluorine-19. At standard pressure and temperature, fluorine is a pale yellow gas composed of diatomic...	F₂	7782-41-4		Rat	185; ACGIH (1970) STEL-TLV 2ppm	odor threshold 20ppb
Formaldehyde Formaldehyde Formaldehyde is an organic compound with the formula CH2O. It is the simplest aldehyde, hence its systematic name methanal.Formaldehyde is a colorless gas with a characteristic pungent odor. It is an important precursor to many other chemical compounds, especially for polymers... , gas	CH₂O	50-00-0		Rat	0.66; ACGIH (1987) Ceiling limit 0.3ppm		3
Germane Germane Germane is the chemical compound with the formula GeH4, and the germanium analogue of methane. It is the simplest germanium hydride and one of the most useful compounds of germanium. Like the related compounds silane and methane, germane is tetrahedral. It burns in air to produce GeO2 and...	GeH₄	7782-65-2		Rat	622	inadequate	4
Hexaethyl tetraphosphate	(C₂H₅O)₆P₄O₇
Hydrogen azide	HN₃	7782-79-8
Hydrogen cyanide	HCN	74-90-8		Rat	40; ACGIH (1991) ceiling limit 4.7ppm	inadequate	4
Hydrogen selenide Hydrogen selenide Hydrogen selenide is the inorganic compound with the formula H2Se. It is the simplest and virtually the only hydride of selenium. H2Se is a colorless, flammable gas under standard conditions. It is the most toxic selenium compound with an exposure limit: 0.05 ppm over an 8 hour period...	H₂Se	7783-07-5	1	Rat	2; ACGIH (1990) TWA-TLV 0.05ppm	inadequate	4
Hydrogen sulfide Hydrogen sulfide Hydrogen sulfide is the chemical compound with the formula . It is a colorless, very poisonous, flammable gas with the characteristic foul odor of expired eggs perceptible at concentrations as low as 0.00047 parts per million...	H₂S	7783-06-4	100	Rat	712; ACGIH (1990) STEL-TLV 15ppm		4
Hydrogen telluride Hydrogen telluride Hydrogen telluride is the inorganic compound with the formula H2Te. The simplest hydride of tellurium, it is rarely encountered because of it decomposes rapidly to the constituent elements. Most compounds with Te-H bonds are unstable with respect to loss of H2. H2Te is chemically and structurally...	H₂Te	7783-09-7
Nickel tetracarbonyl	Ni(CO)₄	13463-39-3			ACGIH (1980) TWA-TLV 0.05ppm	inadequate	4
Nitrogen dioxide Nitrogen dioxide Nitrogen dioxide is the chemical compound with the formula it is one of several nitrogen oxides. is an intermediate in the industrial synthesis of nitric acid, millions of tons of which are produced each year. This reddish-brown toxic gas has a characteristic sharp, biting odor and is a prominent...	NO₂	10102-44-0				odor threshold 4 ppm
Osmium tetroxide	OsO₄	20816-12-0		Rat
Oxygen difluoride Oxygen difluoride Oxygen difluoride is the chemical compound with the formula F2O. As predicted by VSEPR theory, the molecule adopts a "V" shaped structure like H2O, but it has very different properties, being a strong oxidizer.-Preparation:...	OF₂	7783-41-7		Rat	2.6; ACGIH (1983) ceiling limit 0.05ppm
Perchloryl fluoride Perchloryl fluoride Perchloryl fluoride is a reactive gas with the chemical formula . It has a characteristic sweet odor that resembles gasoline and kerosene. It is toxic and is a powerful oxidizing and fluorinating agent. It is the acid fluoride of perchloric acid....	ClFO₃	7616-94-6		Rat	770; ACGIH (1962) STEL-TLV 6ppm
Perfluoroisobutylene	C₄F₈	382-21-8		Rat	1.2
Phosgene Phosgene Phosgene is the chemical compound with the formula COCl2. This colorless gas gained infamy as a chemical weapon during World War I. It is also a valued industrial reagent and building block in synthesis of pharmaceuticals and other organic compounds. In low concentrations, its odor resembles...	CCl₂O	75-44-5		Rat	5; ACGIH (1992) TWA-TLV 0.1ppm	inadequate	4
Phosphine Phosphine Phosphine is the compound with the chemical formula PH3. It is a colorless, flammable, toxic gas. Pure phosphine is odourless, but technical grade samples have a highly unpleasant odor like garlic or rotting fish, due to the presence of substituted phosphine and diphosphine...	PH₃	7803-51-2	50		NIOSH 0.3ppm time weighted average; ACGIH (1992) STEL-TLV 1ppm	inadequate	4
Phosphorus pentafluoride Phosphorus pentafluoride Phosphorus pentafluoride, PF5, is a phosphorus halide. It's a colourless gas at room temperature and pressure.-Structure:Single-crystal X-ray studies indicate PF5 molecule has two distinct P−F bonds : P−Fax = 158.0 pm and P−Feq = 152.2 pm...	PF₅	7647-19-0		Rat	260
Selenium hexafluoride Selenium hexafluoride Selenium hexafluoride is the inorganic compound with the formula SeF6. It is a colourless gas described as having a "repulsive" odor. It is not widely encountered and has no commercial applications.-Structure, preparation, and reactions:...	SeF₆	7783-79-1	2	Rat	50; ACGIH (1992) TWA-TLV 0.05ppm
Silicon tetrachloride Silicon tetrachloride Silicon tetrachloride is the inorganic compound with the formula SiCl4. It is a colourless volatile liquid that fumes in air. It is used to produce high purity silicon and silica for commercial applications.-Preparation:...	SiCl₄	10026-04-7		Rat	750
Silicon tetrafluoride Silicon tetrafluoride Silicon tetrafluoride or Tetrafluorosilane is the chemical compound with the formula SiF4. This tetrahedral molecule is notable for having a remarkably narrow liquid range...	SiF₄	7783-61-1		Rat	450
Stibine Stibine Stibine is the chemical compound with the formula SbH3. This colourless gas is the principal covalent hydride of antimony and a heavy analogue of ammonia. The molecule is pyramidal with H–Sb–H angles of 91.7° and Sb–H distances of 1.707 Å...	H₃Sb	7803-52-3	5	Rat	20		4
Disulfur decafluoride Disulfur decafluoride Disulfur decafluoride is a gas discovered in 1934 by Denbigh and Whytlaw-Gray. Each S of the S2F10 molecule is octahedral, and surrounded by 5 fluorines. S2F10 is highly toxic, with toxicity similar to phosgene...	S₂F₁₀	5714-22-7	1		ACGIH (1962) ceiling limit 0.01ppm		4
Sulfur tetrafluoride Sulfur tetrafluoride Sulfur tetrafluoride is the chemical compound with the formula SF4. This species exists as a gas at standard conditions. It is a corrosive species that releases dangerous HF upon exposure to water or moisture...	SF₄	7783-60-0		Rat	40; ACGIH (1992) ceiling limit 0.1ppm		3
Tellurium hexafluoride Tellurium hexafluoride Tellurium hexafluoride is the oldest known fluoride of tellurium. It is a colorless, highly toxic gas with an extremely unpleasant smell.-Preparation:...	TeF₆	7783-80-4		Rat	25; ACGIH (1992) TWA-TLV 0.02ppm
Tetraethyl pyrophosphate Tetraethyl pyrophosphate Tetraethyl pyrophosphate, abbreviated TEPP, is an organophosphate compound. It is used as a pesticide.This compound is a clear, colorless liquid. It is soluble in water, but hydrolyzes rapidly. It was first synthesized by Philippe de Clermont...	C₈H₂₀O₇P₂				ACGIH (2006) TWA-TLV 0.01mg/cubic meter
Tetraethyl dithiopyrophosphate	C₈H₂₀O₅P₂S₂
Trifluoro acetylchloride	C₂ClF₃O	354-32-5		Rat	1000
Tungsten hexafluoride	WF₆	7783-82-6		Rat	217	inadequate

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