{{Chembox
| Watchedfields = chynged
| verifiedrevid = 451527415
| ImageFile1 = File:Ozone-1,3-dipole.png
| ImageFile1_Ref = {{chemboximage|correct|??}}
| ImageName1 = Skeletal formula o ozone wi pairtial chairges shawn
| ImageFileR2 = Ozone-CRC-MW-3D-vdW.png
| ImageFileR2_Ref = {{chemboximage|correct|??}}
| ImageNameR2 = Spacefill model o ozone
| ImageFileL2 = Ozone-CRC-MW-3D-balls.png
| ImageFileL2_Ref = {{chemboximage|correct|??}}
| ImageNameL2 = Baw an stick model o ozone
| IUPACName = Trioxygen
|Section1={{Chembox Identifiers
| IUPHAR_ligand = 6297
| CASNo = 10028-15-6
| CASNo_Ref = {{cascite|correct|CAS}}
| PubChem = 24823
| ChemSpiderID = 23208
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| UNII = 66H7ZZK23N
| UNII_Ref = {{fdacite|correct|FDA}}
| EINECS = 233–069–2
| MeSHName = Ozone
| RTECS = RS8225000
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 25812
| Gmelin = 1101
| SMILES = [O-][O+]=O
| SMILES1 = [O-][O+][O-]
| StdInChI = 1S/O3/c1-3-2
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| InChI = 1/O3/c1-3-2
| StdInChIKey = CBENFWSGALASAD-UHFFFAOYSA-N
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| InChIKey = CBENFWSGALASAD-UHFFFAOYAY
}}
|Section2={{Chembox Properties
| Solvent =
| O=3
| Appearance = colourless tae pale blue gas<ref name=PGCH/>
| Odor = pungent<ref name=PGCH/>
| Density = 2.144 mg cm<sup>−3</sup> (at 0&nbsp;°C)
| Solubility = 1.05 g L<sup>−1</sup> (at 0&nbsp;°C)
| SolubleOther = very soluble in [[carbon tetrachloride|CCl<sub>4</sub>]], [[sulfuric acid]]
| MeltingPtK = 81
| BoilingPtK = 161
| RefractIndex = 1.2226 (liquid), 1.00052 (gas, STP, 546 nm&nbsp;— note heich dispersion)<ref>{{cite journal|last1=Cuthbertson|first1=Clive|last2=Cuthbertson|first2=Maude|title=On the Refraction and Dispersion of the Halogens, Halogen Acids, Ozone, Steam Oxides of Nitrogen, and Ammonia|journal=[[Philosophical Transactions of the Royal Society A]]|date=1914|volume=213|pages=1–26|doi=10.1098/rsta.1914.0001|url=https://archive.org/stream/philtrans08506476/08506476#page/n17/mode/1up|accessdate=4 February 2016|bibcode = 1914RSPTA.213....1C }}</ref>
| VaporPressure = >1 atm (20&nbsp;°C)<ref name=PGCH/>
}}
|Section3={{Chembox Structure
| SpaceGroup = C<sub>2v</sub>
| Coordination = Digonal
| MolShape = Dihedral
| OrbitalHybridisation = ''sp''<sup>2</sup> for O1
| Dipole = 0.53 D
}}
|Section4={{Chembox Thermochemistry
| DeltaHf = 142.67 kJ mol<sup>−1</sup>
| Entropy = 238.92 J K<sup>−1</sup> mol<sup>−1</sup>
}}
|Section5={{Chembox Hazards
| EUClass = {{Hazchem O}}{{Hazchem Xi}}
| NFPA-H = 2
| NFPA-F = 0
| NFPA-R = 4
| NFPA-S = Ox
| IDLH = 5 ppm<ref name=PGCH>{{PGCH|0476}}</ref>
| REL = C 0.1 ppm (0.2 mg/m<sup>3</sup>)<ref name=PGCH/>
| PEL = TWA 0.1 ppm (0.2 mg/m<sup>3</sup>)<ref name=PGCH/>
| LCLo = 12.6 ppm (mouse, 3 hr)<br/>50 ppm (human, 30 min)<br/>36 ppm (rabbit, 3 hr)<br/>21 ppm (mouse, 3 hr)<br/>21.8 ppm (rat, 3 hr)<br/>24.8 ppm (guinea pig, 3 hr)<br/>4.8 ppm (rat, 4 hr)<ref>{{IDLH|10028156|Ozone}}</ref>
}}
|Section8={{Chembox Related
| OtherCompounds = [[Sulfur dioxide]]<br />[[Trisulfur]]<br />[[Disulfur monoxide]]<br />[[Cyclic ozone]]
}}
}}
'''Ozone''' (seestematically named '''1λ<sup>1</sup>,3λ<sup>1</sup>-trioxidane''' an '''''catena''-trioxygen'''), or '''trioxygen''', is an inorganic molecule wi the [[chemical formula]] '''{{Chem|O|3|}}'''. It is a pale blue gas wi a distinctively pungent smell. It is an [[allotrope]] o [[oxygen]] that is much less stable nor the [[diatomic]] allotrope {{Chem|O|2}}, breakin doun in the lawer atmosphere tae normal [[dioxygen]]. Ozone is formed frae dioxygen bi the action o [[ultraviolet]] licht an an aa atmospheric electrical discharges, an is present in law concentrations throuoot the [[Yird's atmosphere]] (stratosphere). In tot, ozone maks up anly {{val|0.6|ul=ppm}} o the atmosphere.