ozone
Enable an AI agent to recognise ozone, assess its amount and changing state in a specified environment, and determine whether monitoring, treatment, containment or removal is justified.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise ozone, assess its amount and changing state in a specified environment, and determine whether monitoring, treatment, containment or removal is justified.
Ozone is the triatomic allotrope of oxygen (O₃), a bent polar C₂v molecule generated by addition of ground-state oxygen atoms to O₂, and encountered as the stratospheric ultraviolet filter, a short-lived tropospheric oxidant and air pollutant, and an industrial disinfectant/oxidant.
It can be Identify and quantify ozone using a method suitable for the carrier, concentration range and relevant interferents.; Track ozone formation, transport and disappearance to locate causes of accumulation or loss.; Compare observations against a named criterion using matching units, sampling locations and averaging periods.; Evaluate a proposed ozone treatment using delivered dose, measured residual, contact conditions and independent outcome evidence.; Select an authorised containment, isolation or ozone-destruction action using exposure and compatibility evidence.; Verify ozone residuals and relevant reaction products before declaring a treatment, clearance or release condition satisfied..
Distinguishing features
Require chemical identity consistent with O3 rather than O2 or atomic oxygen; ozone consists of three oxygen atoms. [EPA: What is Ozone?](https://www.epa.gov/ozone-pollution-and-your-patients-health/what-ozone)
Require an ozone-selective measurement or identification method with documented interference control; an undifferentiated oxidant response does not establish ozone identity.
Distinguish ozone itself from ozonated air or water by recording O3 as a constituent with its own measured concentration and a separately identified carrier.
Treat ground-level and stratospheric ozone as the same chemical substance in different environmental contexts, rather than different substances. [EPA: Ozone and Ozone Standards - The Basics](https://www.epa.gov/sites/default/files/2016-04/documents/20151001basicsfs.pdf)
Distinguish the presence of ozone from labels such as active oxygen, oxygenated or fresh-smelling; require evidence identifying O3 rather than inferring it from a product name or sensory impression.
Scope
+ Identification of O3 and distinction between the substance, its carrier medium and products containing it.
+ Ozone concentration or amount with measurement basis, location, time and uncertainty.
+ Formation, transport, dissolution, consumption and decomposition of ozone in the represented environment.
+ Ozone-specific reaction potential, treatment performance and residual verification.
+ Exposure pathways, material compatibility and evidence governing ozone-related actions.
- Oxygen O2, atomic oxygen and other reactive oxygen species as independently modelled substances.
- The ozone layer, atmospheric circulation, smog and climate systems as whole phenomena.
- Ozone generators, contactors, monitors and destruction equipment as engineered assets.
- Air, water and commercial mixtures as complete material compositions.
- Diseases, organism responses and clinical management of exposure.
- Regulations, treatment protocols and facility operating procedures as authoritative documents.
Characteristics
- Ozone identity evidence
- Chemical identity O3 linked to analytical evidence, supplier evidence or an explicitly unverified assertion Prevents oxygen, generic oxidants and marketing labels from being treated as verified ozone.
- Carrier and occurrence context
- Ambient air, indoor air, process gas, aqueous solution, other specified matrix Determines which measurements, exposure pathways and actions are relevant.
- Physical state
- Gas, liquid, solid or dissolved constituent, with temperature and pressure Distinguishes ozone's physical condition from the bulk phase of a carrier.
- Gas-phase concentration
- nmol/mol (ppb), µmol/mol (ppm) or mg/m³; specify wet/dry basis and temperature and pressure where needed Supports valid comparisons without conflating mole fractions, mass concentrations or reference conditions.
- Dissolved ozone concentration
- mg/L of O3 with sampling location, sampling time and analytical method Distinguishes ozone present in the liquid from ozone supplied upstream.
- Observation support and quality
- Sampling volume or footprint, timestamp, averaging interval, method, calibration, detection limit and uncertainty Determines what the observation represents and whether it can support a decision.
- Atmospheric column abundance
- Dobson units or molecules/m² with vertical bounds and retrieval method Keeps integrated atmospheric abundance distinct from concentration at a breathing location.
- Formation or introduction pathway
- Linked photochemical process, electrical discharge, process feed, transported source or unknown origin Identifies whether action must address local production, supplied ozone or incoming transport.
- Persistence under current conditions
- Observed concentration-time series or fitted decay rate with matrix, temperature, light and fit validity Supports time-bounded predictions without assuming a universal ozone lifetime.
- Ozone demand
- Mass of O3 consumed per specified volume or mass of matrix over a stated interval Separates supplied dose from ozone remaining available for the intended reaction.
- Treatment exposure
- Integral of measured ozone concentration over contact time, such as mg·min/L, with contact conditions Provides process evidence to compare with a separately validated treatment criterion.
- Action eligibility
- Undetermined, conditions satisfied or conditions failed for a named action and validity interval Makes permission depend on evidence and context instead of a universal safe or unsafe label.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 31 questions.
Ozone identity and occurrence Establish what is being called ozone and the material or environmental occurrence being represented.
O3 must remain distinguishable from ordinary oxygen, generic oxidants, ozone-containing mixtures and the atmospheric ozone layer.
Chemical recognition
Record evidence supporting identification of the substance as O3.
Verified O3 identity
Require an explicit chemical identity and evidence appropriate to the occurrence, with uncertain identification retained as uncertain.
- What evidence identifies O3 rather than O2, another oxidant or an unspecified active-oxygen product? definition
- Who or what supplied the identification, and was it analytically verified for this occurrence? provenance
Carrier and occurrence boundary
Separate ozone from its carrier and define the extent of the represented occurrence.
Bounded ozone occurrence
Identify whether the record concerns a sample, process stream, dissolved constituent or environmental volume, including its spatial and temporal limits.
- Which sample, stream or environmental volume contains the ozone, and over what interval is it represented? boundary
- Which properties describe O3 itself, and which belong to the carrier, mixture or surrounding atmospheric system? boundary
Ozone amount and observation Make ozone measurements interpretable across gas, liquid and atmospheric observations.
A dissolved residual, gas mixing ratio and atmospheric column abundance answer different questions and cannot be substituted for one another.
Quantity and reference basis
Describe the measured ozone quantity and the conditions required to interpret it.
Comparable ozone quantity
Record units, phase or carrier, reference conditions and averaging or integration bounds before comparing values.
- Is the value a gas mole fraction, mass concentration, dissolved concentration, total amount or atmospheric column abundance? measurement
- What temperature, pressure, wet/dry basis and temporal or vertical integration limits are needed to interpret or convert it? measurement
Ozone measurement validity
Establish whether the method and sample handling support the claimed ozone observation.
Selectivity and sample integrity
Record calibration, interference checks, detection capability and assessed ozone losses between the occurrence and measurement.
- Which method, calibration and interference checks support the reported ozone value and uncertainty? provenance
- How were sampling delay, tubing or vessel interactions, and changes during sample handling assessed? measurement
- Does a low result mean quantified ozone, below detection, below quantification or an invalid measurement? measurement
Ozone formation, transfer and loss Explain changes in the represented ozone occurrence through production, introduction, movement and removal.
An ozone measurement is time-sensitive; choosing an effective intervention requires distinguishing production from transport and consumption.
Formation and delivery
Identify how ozone enters or forms within the represented boundary.
Attributed ozone input
Link ozone to evidenced formation processes, supplied streams or transport, without treating a suspected source as established.
- Was this ozone formed locally, deliberately supplied or transported into the boundary, and what supports that attribution? provenance
- What observations distinguish generator output or incoming ozone from the amount actually delivered to the location of interest? measurement
Persistence and removal
Characterise ozone loss and redistribution under the conditions actually present.
Condition-dependent ozone fate
Separate reaction or decomposition from dilution and phase transfer, and constrain predictions to observed or validated conditions.
- What concentration-time evidence constrains persistence in this matrix at the recorded temperature, light exposure and mixing conditions? measurement
- How much apparent ozone loss represents chemical consumption, dilution, transfer to another phase or measurement artefact? boundary
- When must ozone be measured again before an earlier observation can support another action? action
Ozone reactions and treatment Represent intended ozone reactions, competing consumption and evidence of treatment outcome.
Supplying ozone does not by itself establish useful contact, successful treatment or acceptable reaction products.
Target contact and demand
Relate ozone available at the target to the intended chemical or biological outcome.
Effective ozone contact
Distinguish applied dose, competing matrix demand and measured residual throughout the relevant contact period.
- What target reaction or treatment outcome is intended, and what validated criterion connects it to ozone contact under these conditions? action
- What delivered dose, residual profile, contact time and competing ozone demand were actually measured? measurement
Reaction outcomes and products
Track intended results and matrix-specific products requiring separate evaluation.
Verified treatment and product fate
Require outcome evidence separate from ozone application, and link reaction products to their own substance assessments.
- What independent observation demonstrates that the intended target was transformed or the treatment objective was achieved? measurement
- Which reaction products need investigation for this matrix, and what evidence supports their identification and disposition? boundary
Ozone exposure and action controls Connect ozone observations to exposed receptors, contacted materials and the conditions for a proposed action.
Ozone's respiratory effects make exposure context material to decisions; the relevant evidence must concern where exposure occurs. [NIOSH: Ozone](https://archive.cdc.gov/www_cdc_gov/niosh/topics/ozone/default.html)
Receptors and contacted materials
Identify who or what can encounter ozone and the evidence needed to assess that contact.
Ozone contact assessment
Link exposure location and duration to affected people, organisms and materials, including possible transfer from treated liquid to surrounding gas.
- Which people, organisms or materials can encounter ozone, by which pathway and for how long? boundary
- What measurements at the exposure location and what ozone-specific material compatibility evidence support the assessment? measurement
Action criteria and clearance
Bind ozone-related actions to applicable criteria and verified current conditions.
Evidence-bound ozone action
Record the proposed action, governing criterion, required controls and verification evidence without inventing a universal permissible concentration.
- Which current rule or validated procedure governs this action, jurisdiction, receptor and averaging period? provenance
- What conditions must be verified before ozone generation, treatment, access, discharge or restart may proceed? action
- After isolation or ozone destruction, what residual measurements and reaction-product checks establish that the named clearance condition is satisfied? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Stratospheric ozone (ozone layer)
- Tropospheric / ground-level ozone (photochemical smog and background)
- Generated process ozone for water and wastewater treatment
- Dissolved aqueous ozone residual
- Industrial process ozone (pulp bleaching, chemical oxidation, electronics)
- Medical ozone-oxygen mixtures
- Condensed / refrigerated liquid ozone
- Indoor and occupational ozone (corona, UV, welding, copiers, air cleaners)
- Which of these kinds and varieties hold for the sense of ozone this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q36933 - Item for the chemical substance ozone / trioxygen.
- CAS Registry Number - 10028-15-6 - Substance identifier for O₃.
- PubChem CID - 24823 - NCBI PubChem compound record.
- EC number - 233-069-2 - EINECS identifier.
- ChEBI - CHEBI:25812 - Chemical Entities of Biological Interest.
- InChIKey - CBENFWSGALASAD-UHFFFAOYSA-N - Standard InChIKey for O₃.
- UN number - UN 1951 - Dangerous-goods number for ozone, refrigerated liquid; gaseous ozone is not a normal compressed-gas commodity because it decomposes.
- IUPAC name - trioxygen - Systematic name; common name remains ozone.
- Which of these identifiers and schemes hold for the sense of ozone this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Vienna Convention for the Protection of the Ozone Layer (1985) - UNEP / United Nations
- Montreal Protocol on Substances that Deplete the Ozone Layer (1987, as adjusted) - UNEP Ozone Secretariat
- WHO Global Air Quality Guidelines (2021) for O₃ - World Health Organization
- U.S. EPA National Ambient Air Quality Standards for ozone (currently 0.070 ppm, 8-hour) - U.S. Environmental Protection Agency
- Directive 2008/50/EC on ambient air quality and cleaner air for Europe (ozone target values) - European Union
- OSHA 29 CFR 1910.1000 Table Z-1 ozone PEL - U.S. Occupational Safety and Health Administration
- ACGIH Threshold Limit Values for ozone (workload-dependent) - ACGIH
- ISO 13964 (UV photometric determination of ozone in ambient air) - International Organization for Standardization
- EN 14625 (ambient air, UV photometry of ozone) - CEN
- FDA 21 CFR 184.1563 (ozone as GRAS in bottled water) and 21 CFR 173.368 (antimicrobial use) - U.S. Food and Drug Administration
- Which of these standards and regulation hold for the sense of ozone this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Natural stratospheric column that absorbs Hartley-band UV and thereby limits UV-B at the surface
- Tropospheric photochemical pollutant affecting human lungs, crops and materials in urban and downwind rural air
- Primary or intermediate disinfectant/oxidant in municipal drinking-water plants, especially in parts of Europe
- Wastewater and industrial-effluent colour, COD and micropollutant oxidation
- Elemental-chlorine-free and totally-chlorine-free pulp bleaching
- Cold sanitation of food-contact surfaces, produce and bottled water
- Supplementary oxidant in swimming pools and spas
- Criegee ozonolysis of alkenes in laboratory and fine-chemical synthesis
- Medical ozone-oxygen mixtures in some jurisdictions (not an FDA-approved drug in the United States)
- Which of these real-world use hold for the sense of ozone this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Ground-level mixing ratio - 10-200 (background to polluted urban/smog peaks) - ppbv
- Stratospheric mixing ratio (ozone-layer peak, ~15-35 km) - 1-10 - ppmv
- Total ozone column - 220-450 (Antarctic spring hole often below 220) - Dobson unit (DU)
- Dissolved ozone residual in drinking water - 0.1-0.5 (contact-tank values can be a few mg/L before decay) - mg/L
- Occupational air concentration (OSHA 8-h PEL as the practical upper bound) - up to 0.1 - ppm
- Off-gas from oxygen-fed corona generators - 6-14 - wt% O₃ in O₂
- Odour threshold in air - 0.01-0.05 - ppm
- Which of these typical measurements hold for the sense of ozone this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Acute inhalation injury, cough, and pulmonary oedema well above occupational limits
- Asthma exacerbation and reduced lung function from repeated urban ozone exposure
- Foliar injury and yield loss in crops and forests
- Catalytic stratospheric depletion by chlorine and bromine from ODS (Antarctic ozone hole)
- Cracking of unsaturated elastomers, paints and some plastics at modest ambient concentrations
- Explosive decomposition of concentrated or liquid ozone in contact with organics or on shock
- Bromate (BrO₃⁻) formation when bromide-bearing waters are ozonated
- NOx formation in air-fed corona generators, contaminating the product gas
- Consumer ozone air cleaners that can exceed indoor exposure limits while claiming purification
- Which of these failure modes and hazards hold for the sense of ozone this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Surface ozone is reported in ppm/ppb in U.S. regulatory practice and in µg/m³ under WHO and EU law (conversion ≈ 2 µg/m³ per ppb at 20 °C, 1 atm)
- Antarctic spring ozone hole is a distinct seasonal, polar phenomenon; Arctic depletion is usually weaker
- Drinking-water ozonation is historically more established in France, Switzerland and the Netherlands than in much of the chlorine/chloramine-dominated United States
- Medical ozone therapy is practised in German-speaking countries, Russia and Cuba far more than in mainstream US/UK medicine
- Montreal Protocol Article 5 gave developing countries later ODS phase-out schedules than non-Article 5 parties
- Public communication splits "good up high, bad nearby" (U.S. EPA) versus column-ozone and UV-index messaging in polar and high-UV regions
- Which of these regional variation hold for the sense of ozone this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Dioxygen (O₂) - O₃ is triatomic and absorbs strongly in the Hartley band near 254 nm; O₂ does not. Indigo decolorization and KI/starch respond to ozone, not to ordinary oxygen.
- Singlet oxygen (¹Δg O₂) - Same elemental formula as O₂, not O₃; detected by 1270 nm phosphorescence, not by UV ozone photometry.
- Free chlorine / hypochlorite - Alternative water disinfectant; indigo trisulfonate is used for ozone residual, DPD for free chlorine. Chlorine leaves a persistent residual; ozone does not.
- Hydrogen peroxide - Aqueous liquid oxidant without the gas-phase Hartley UV signature; catalase destroys H₂O₂ selectively relative to ozone in residual tests.
- Nitrogen dioxide - Co-pollutant in photochemical smog; measured by chemiluminescence/NOx analysers. UV ozone photometers need an O₃/NO₂ discrimination (scrubber or dual-beam) because NO₂ can interfere.
- Atomic oxygen and hydroxyl radical - Co-oxidants in plasma, UV and the atmosphere, but too short-lived to persist as a measurable residual the way O₃ does.
- Marketing "activated oxygen" / ionizer output - Not a defined chemical; ion counters and UV photometers show whether any O₃ is actually present.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of ozone this model covers, and on what evidence? provenance
Sources
- PubChem Compound Summary for CID 24823, Ozone - Identity (CAS, molecular formula, InChIKey), physical properties, and common identifiers.
- Wikidata item Q36933 (ozone) - Canonical catalogue identifier and crosswalks to CAS, ChemSpider, and UN numbers.
- WHO global air quality guidelines: particulate matter, ozone, nitrogen dioxide, sulfur dioxide and carbon monoxide - Health-based ambient ozone guideline values (peak-season and 8-hour) used in air-quality practice.
- National Ambient Air Quality Standards (NAAQS) for ozone - U.S. regulatory definition of ground-level ozone as a criteria pollutant and the 0.070 ppm 8-hour standard.
- Montreal Protocol on Substances that Deplete the Ozone Layer (1987, as adjusted and amended) - International legal regime protecting stratospheric ozone by controlling ODS, distinct from tropospheric ozone air-quality law.
- ISO 13964: Ambient air - Determination of ozone - Ultraviolet photometric method - Reference measurement principle (UV photometry in the Hartley band) that separates ozone from neighbouring oxidants in air monitoring.
- 29 CFR 1910.1000 Table Z-1, Air contaminants (ozone) - U.S. occupational exposure limit (PEL 0.1 ppm, 8-hour TWA) used as a practical concentration bound.
- Scientific Assessment of Ozone Depletion: 2022 - Stratospheric column amounts, Dobson-unit practice, Antarctic ozone-hole definition, and catalytic depletion chemistry.
What the second pass must settle
- Which existing Vercy world model, if any, already owns ozone as a substance and should be linked instead of creating a separate publication?
- Which analytical methods, interference controls and sample-handling limits are validated for the ozone matrices and concentration ranges this model must support?
- What evidence supports persistence estimates in each intended environment, and how should the model limit extrapolation beyond measured conditions?
- Which treatment-specific contact criteria, competing reactions and reaction-product assessments are required for the intended uses, including whether bromate monitoring applies to bromide-containing waters?
- Which current jurisdictional criteria and material compatibility references should govern the model's action decisions for each supported setting?