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The Vienna Convention for the Protection of the Ozone Layer and the Montreal Protocol on Substances that Deplete the Ozone Layer logo was developed to provide a distinct brand for the two treaties across various communication assets and applications. The visual identity guideline is designed to provide a comprehensive overview of applications and correct use of the logo.

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Climate Change and Ozone Layer Depletion Hotspots in Air-conditioning Systems

Air-conditioning (A/C) systems have become essential in today’s life, providing space and comfort cooling. In 2021, the global demand for A/C reached nearly 111 million units with the majority used in residential (96 million units) and commercial sectors (14.5 million units). These systems use refrigerants that may still be ozone-depleting substances (ODS) and are also often potent greenhouse gases (GHG). Depending on the efficiency levels and usage patterns, the operation of A/C requires substantial amounts of electricity, contributing their indirect climate impacts. Increasing ambient temperatures in many regions, particularly in the last decade, have driven demand for space cooling provided by air conditioners.

Climate Change and Ozone Layer Depletion Hotspots in the Food Cold Chain

Globally, food systems are responsible for approximately one-quarter of the world’s greenhouse gas (GHG) emissions, with the supply chain alone (which includes food processing, transport, packaging, and retail) contributing 18% to these emissions. The cold chain plays an important role in reducing food loss and waste (FLW), which accounts for approximately 6-8% of global emissions. However, the cold chains themselves can also significantly contribute to climate change and the depletion of the ozone layer. This is primarily due to the use of ozone-depleting substances (ODS) and greenhouse gases as refrigerants, and also emissions from the electricity necessary to operate the cold chain equipment.

Continuing benefits of the Montreal Protocol and protection of the stratospheric ozone layer for human health and the environment

The protection of Earth’s stratospheric ozone (O3) is an ongoing process under the auspices of the universally ratified Montreal Protocol and its Amendments and adjustments. A critical part of this process is the assessment of the environmental issues related to changes in O3. The United Nations Environment Programme’s Environmental Effects Assessment Panel provides annual scientific evaluations of some of the key issues arising in the recent collective knowledge base. This current update includes a comprehensive assessment of the incidence rates of skin cancer, cataract and other skin and eye diseases observed worldwide; the effects of UV radiation on tropospheric oxidants, and air and water quality; trends in breakdown products of fluorinated chemicals and recent information of their toxicity; and recent technological innovations of building materials for greater resistance to UV radiation. These issues span a wide range of topics, including both harmful and beneficial effects of exposure to UV radiation, and complex interactions with climate change. While the Montreal Protocol has succeeded in preventing large reductions in stratospheric O3, future changes may occur due to a number of natural and anthropogenic factors. Thus, frequent assessments of potential environmental impacts are essential to ensure that policies remain based on the best available scientific knowledge.

Dear Sir/Madam,

Please find attached the invitation for the forty-sixth meeting of the Open-ended Working Group of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer to be held in Montreal from 8 to 12 July 2024.

Using the exclusive link provided for your delegation, please register your representatives to the meeting as soon as possible.

Please note that Firefox and Chrome are the preferred browsers for the registration system. The step-by-step guide on the system is available here. The system already contains information on delegates who have attended previous Montreal Protocol meetings. Please update the existing information as necessary. Information will need to be entered for delegates who have not attended past meetings. Please ensure that you provide a valid email address for each of your representatives.

Yours sincerely,

Ozone Secretariat
mea-ozoneinfo@un.org
http://ozone.unep.org

Madame/Monsieur,

Veuillez trouver ci-joint l'invitation à la quarante-sixième réunion du Groupe de travail à composition non limitée des Parties au Protocole de Montréal relatif à des substances qui appauvrissent la couche d'ozone, qui se tiendra à Montréal du 8 au 12 juillet 2024.

En utilisant le lien exclusif fourni pour votre délégation, veuillez inscrire vos représentants aux réunion dès que possible.

Veuillez noter que Firefox et Chrome sont les navigateurs recommandés pour le système d'inscription. Le guide étape par étape du système est disponible ici. Le système contient déjà des informations sur les délégués qui ont assisté aux réunions précédentes du Protocole de Montréal. Veuillez mettre à jour les informations existantes si nécessaire. Pour les délégués qui n’ont pas assisté aux réunions précédentes, des informations devront être saisies. Veuillez vous assurer de fournir un courrier électronique valide pour chacun de vos représentants.

Cordialement,

Secrétariat de l'ozone
mea-ozoneinfo@un.org
http://ozone.unep.org

Estimado Señor/Estimada Señora:

Se adjunta la invitación para la 46ª reunión del Grupo de Trabajo de composición abierta de las Partes en el Protocolo de Montreal sobre las Sustancias que Agotan la Capa de Ozono, que se celebrará en Montreal del 8 al 12 de julio de 2024.

Utilizando el enlace exclusivo que se proporciona para su delegación, registre a sus representantes en las reunión lo antes posible.

Tenga en cuenta que Firefox y Chrome son los navegadores recomendados para el sistema de registro. La guía paso a paso del sistema está disponible aquí. El sistema ya contiene información sobre los delegados que han asistido a reuniones anteriores del Protocolo de Montreal. Actualice la información existente según sea necesario. Para los delegados que no hayan asistido a reuniones anteriores, será necesario ingresar sus informaciones. Asegúrese de proporcionar una dirección de correo electrónico válida para cada uno de sus representantes.

Atentamente,

Secretaría del Ozono
mea-ozoneinfo@un.org
http://ozone.unep.org

Abstract. We summarise current important and well-established open issues related to the depletion of stratospheric ozone and discuss some newly emerging challenges. The ozone layer is recovering from the effects of halogenated source gases due to the continued success of the Montreal Protocol despite recent renewed production of controlled substances and the impact of uncontrolled very short-lived substances. The increasing atmospheric concentrations of greenhouse gases, such as carbon dioxide, methane (CH4) and nitrous oxide (N2O), have large potential to perturb stratospheric ozone in different ways, but their future evolutions, and hence impacts, are uncertain.

Ref:  Oz.Sec/MOP35 Decisions                                                                                                    16 February 2024

Dear Sir/Madam,

The Ozone Secretariat is pleased to transmit, for your kind attention, a letter from the Executive Secretary, with regard to decisions XIV/7, XXXI/3, XXXIV/8 and XXXV/12 on cases of illegal trade in controlled substances and prevention of illegal production and consumption.

Yours sincerely, 

Ozone Secretariat  


UN Environment Programme
P.O. Box 30552 (00100)  
Nairobi, Kenya  
Telephone: +254 20 762 3611  
mea-ozoneinfo@un.org  
http://ozone.unep.org 

Ref:  Oz.Sec/MOP35 Decisions                                                                                                    Le 16 février 2024

Madame/Monsieur,

Le Secrétariat de l'ozone a le plaisir de transmettre, à votre attention, une lettre de la Secrétaire exécutive concernant les décisions XIV/7, XXXI/3, XXXIV/8 et XXXV/12 sur les cas de commerce illicite des substances réglementées et la prévention de production et consommation illicite.

Cordialement,

Secrétariat de l'ozone

Programme des Nations Unies pour l'environnement
P.O. Box 30552 (00100)  
Nairobi, Kenya  
Telephone: +254 20 762 3611  
mea-ozoneinfo@un.org  
www.ozone.unep.org 

Ref:  Oz.Sec/MOP35 Decisions                                                                                                    16 de febrero de 2024

Estimado Señor/Estimada Señora:

La Secretaría del Ozono se complace en transmitir, para su atención, una carta de la Secretaria Ejecutiva, en relación con las decisiones XIV/7, XXXI/3, XXXIV/8 y XXXV/12 sobre casos de comercio ilícito de sustancias controladas y prevención de producción y consumo ilícitos.

Atentamente,

Secretaría del Ozono

Programa de las Naciones Unidas para el Medio Ambiente
P.O. Box 30552 (00100)  
Nairobi, Kenya  
Telephone: +254 20 762 3611  
mea-ozoneinfo@un.org  
www.ozone.unep.org