SIST ISO 13964:1999/A1:2025

Air quality - Determination of ozone in ambient air - Ultraviolet photometric method - Amendment 1: Consensus value for the ozone absorption cross-section at room temperature at the mercury-line wavelength (253,65 nm air)

Qualité de l'air - Dosage de l'ozone dans l'air ambiant - Méthode photométrique dans l'ultraviolet - Amendement 1: Valeur consensuelle pour la section efficace d'absorption de l’ozone à température ambiante pour la raie du mercure de longueur d'onde (253,65 nm, air)

Kakovost zraka - Določanje ozona v zunanjem zraku - Ultravijolična fotometrijska metoda - Dopolnilo A1: Dogovorjena vrednost za absorpcijski presek ozona pri sobni temperaturi pri valovni dolžini živega srebra (253,65 nm v zraku)

General Information

• Status: Published
• Public Enquiry End Date: 02-Jul-2025
• Publication Date: 20-Jul-2025
• ICS: 13.040.20 - Ambient atmospheres
• Technical Committee: KAZ - Air quality
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Jul-2025
• Due Date: 22-Sep-2025
• Completion Date: 21-Jul-2025
• Ref Project: ISO 13964:1998/Amd 1:2024 - Air quality - Determination of ozone in ambient air - Ultraviolet photometric method - Amendment 1: Consensus value for the ozone absorption cross-section at room temperature at the mercury-line wavelength (253,65 nm air)

Relations

• Amends: SIST ISO 13964:1999 - Air quality -- Determination of ozone in ambient air -- Ultraviolet photometric method
• Effective Date: 01-Sep-2025

Overview

ISO 13964:1998/Amd 1:2024 is an amendment to ISO 13964 (Ultraviolet photometric method) that provides a consensus value for the ozone absorption cross‑section at room temperature for the mercury-line wavelength 253.65 nm (air). The amendment updates numeric constants, formula parameters and bibliographic references used in the UV photometric determination of ozone in ambient air to reflect current metrological consensus and improved accuracy.

Key topics and technical changes

• Consensus absorption value: The amendment updates the ozone absorption cross‑section value used in the standard (change from “1,44” to 1.4214 as shown in the revised formulas).
• Precise wavelength: Mercury line wavelength corrected from 253.7 nm → 253.65 nm (air) throughout the document and formulas.
• Reference pressure: Numerical reference pressure adjusted from 101,25 → 101.325 in relevant clauses and formulas.
• Editorial corrections: Minor editorial changes such as changing “back‑pressure” to “backpressure” and standardized numeric presentation in formulas (Formulas (1)–(3) and clause updates).
• Updated references: Reference [3] replaced by the 2019 Metrologia literature review recommending the consensus value; a BIPM 2022 report on units, significant digits and rounding for the 253.65 nm cross‑section is added as Reference [16].
• Affected clauses: Revisions applied to Clause 1, Clause 3, Clauses 5.1/5.2, 7.1/7.2, and the bibliography.

Practical applications and users

This amendment is directly relevant to:

• Ambient air quality monitoring networks - ensures consistent ozone concentration results across sites using UV photometry.
• Analytical and environmental laboratories - required for correct instrument calibration and data reporting.
• Instrument manufacturers and calibrators - must implement the updated constants and formula inputs in firmware, calibration routines and manuals.
• Regulators and compliance bodies - benefit from harmonized, metrologically‑traceable ozone measurements for standards and legislation.
• Metrologists and standards developers - for applying appropriate significant digits, units and rounding rules per the BIPM recommendation.

Practical steps for implementers:

• Update instrument calibration factors and software to use 253.65 nm and 1.4214 where specified.
• Review formulas and documentation that reference the previous numeric values (Formulas (1)–(3) and clauses noted in the amendment).
• Consult the cited Metrologia (2019) review and BIPM (2022) report for guidance on units, significant digits and rounding.

Related standards

• ISO 13964:1998 (base standard) - UV photometric method for ozone in ambient air.
• Metrology and reporting guidance (BIPM/Metrologia reports referenced in the amendment) for traceability and numeric presentation.

Keywords: ISO 13964:1998/Amd 1:2024, ozone absorption cross-section, 253.65 nm, ultraviolet photometric method, air quality monitoring, calibration, metrology.

Standards Content (Sample)

International
Standard
ISO 13964
First edition
Air quality — Determination of
1998-08-01
ozone in ambient air — Ultraviolet
photometric method
AMENDMENT 1
2024-07
AMENDMENT 1: Consensus value for
the ozone absorption cross-section at
room temperature at the mercury-line
wavelength (253,65 nm air)
Qualité de l'air — Dosage de l'ozone dans l'air ambiant —
Méthode photométrique dans l'ultraviolet
AMENDEMENT 1: Valeur consensuelle pour la section efficace
d'absorption de l’ozone à température ambiante pour la raie du
mercure de longueur d'onde (253,65 nm, air)
Reference number
ISO 13964:1998/Amd.1:2024(en) © ISO 2024

ISO 13964:1998/Amd.1:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 13964:1998/Amd.1:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not repr
...

Norme
internationale
ISO 13964
Première édition
Qualité de l'air — Dosage de l'ozone
1998-08-01
dans l'air ambiant — Méthode
photométrique dans l'ultraviolet
AMENDEMENT 1
2024-07
AMENDEMENT 1: Valeur consensuelle
pour la section efficace d'absorption
de l’ozone à température ambiante
pour la raie du mercure de longueur
d'onde (253,65 nm, air)
Air quality — Determination of ozone in ambient air —
Ultraviolet photometric method
AMENDMENT 1: Consensus value for the ozone absorption cross-
section at room temperature at the mercury-line wavelength
(253,65 nm air)
Numéro de référence
ISO 13964:1998/Amd.1:2024(fr) © ISO 2024

ISO 13964:1998/Amd.1:2024(fr)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2024
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: [phone]
E-mail: [e-mail]
Web: www.iso.org
Publié en Suisse
ii
ISO 13964:1998/Amd.1:2024(fr)
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes nationaux
de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est en général
confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l’ISO participent également aux travaux. L’ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
https://www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité et à l’applicabilité de
tout droit de propriété revendiqué à cet égard. À la date de publication du présent document, l’ISO n'avait pas
reçu notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d’avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/brevets. L’ISO ne saurait être tenue pour responsa
...

SLOVENSKI STANDARD
01-september-2025
Kakovost zraka - Določanje ozona v zunanjem zraku - Ultravijolična fotometrijska
metoda - Dopolnilo A1: Dogovorjena vrednost za absorpcijski presek ozona pri
sobni temperaturi pri valovni dolžini živega srebra (253,65 nm v zraku)
Air quality - Determination of ozone in ambient air - Ultraviolet photometric method -
Amendment 1: Consensus value for the ozone absorption cross-section at room
temperature at the mercury-line wavelength (253,65 nm air)
Qualité de l'air - Dosage de l'ozone dans l'air ambiant - Méthode photométrique dans
l'ultraviolet - Amendement 1: Valeur consensuelle pour la section efficace d'absorption
de l’ozone à température ambiante pour la raie du mercure de longueur d'onde (253,65
nm, air)
Ta slovenski standard je istoveten z: ISO 13964:1998/Amd 1:2024
ICS:
13.040.20 Kakovost okoljskega zraka Ambient atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International
Standard
ISO 13964
First edition
Air quality — Determination of
1998-08-01
ozone in ambient air — Ultraviolet
photometric method
AMENDMENT 1
2024-07
AMENDMENT 1: Consensus value for
the ozone absorption cross-section at
room temperature at the mercury-line
wavelength (253,65 nm air)
Qualité de l'air — Dosage de l'ozone dans l'air ambiant —
Méthode photométrique dans l'ultraviolet
AMENDEMENT 1: Valeur consensuelle pour la section efficace
d'absorption de l’ozone à température ambiante pour la raie du
mercure de longueur d'onde (253,65 nm, air)
Reference number
ISO 13964:1998/Amd.1:2024(en) © ISO 2024

ISO 13964:1998/Amd.1:2024(en)
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 13964:1998/Amd.1:2024(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteri
...