The Ozone Secretariat has prepared three briefing notes to support parts A, B and C of the 9–10 July 2018 Vienna workshop on energy efficiency opportunities in the context of phasing-down hydrofluorocarbons (HFCs). This briefing note, intended for part B, provides an overview of the technical potential to improve the efficiency of refrigeration, air-conditioning and heat pump (RACHP) equipment, looking in particular at ...

The Ozone Secretariat has prepared three briefing notes to support parts A, B and C of the 9 – 10 July 2018 Vienna workshop on energy efficiency opportunities in the context of phasing-down hydrofluorocarbons (HFCs). This briefing note, intended for part C, discusses the promotion of efficient refrigeration, air-conditioning and heat pump (RACHP) equipment, looking in particular at ...

The Ozone Secretariat has prepared three briefing notes to support parts A, B and C of the 9–10 July 2018 Vienna workshop on energy efficiency opportunities in the context of phasing-down hydrofluorocarbons (HFCs). This briefing note, intended for part A, provides an overview of energy and carbon related issues, looking in particular at ...

The Protocol, along with the Vienna Convention, achieved universal participation on 16 September 2009 – the first treaties of any kind in the history of the United Nations system to achieve that aspiration.

This edition has been updated to include all relevant information from 1989 to date.

Welcome to the eleventh edition of the Handbook for the Vienna Convention. This edition has been updated to include all relevant information from 1985 to date. 

The Handbook is structured as follows: section 1 sets out the full text of the Vienna Convention for the Protection of the Ozone Layer (1985). Section 2 comprises the full text of all of the decisions of the Conferences of the Parties, up to and including its eleventh meeting in November 2017. 

Ozone depleting substances (ODSs) controlled by the Montreal Protocol are potent greenhouse gases (GHGs), as are their substitutes, the hydrofluorocarbons (HFCs). Here we provide for the first time a comprehensive estimate of U.S. emissions of ODSs and HFCs based on precise measurements in discrete air samples from across North America and in the remote atmosphere. 

This briefing note outlines the steps that will be used by the Secretariat in calculating the control levels for production, consumption and baseline values of hydrofluorocarbons (HFCs). The calculations will be based on the relevant definitions and provisions of the Montreal Protocol as adjusted and amended, including by the Kigali Amendment and taking into account the various decisions related to data reporting.

It is well established that anthropogenic chlorine-containing chemicals contribute to ozone layer depletion. The successful implementation of the Montreal Protocol has led to reductions in the atmospheric concentration of many ozone-depleting gases, such as chlorofluorocarbons. As a consequence, stratospheric chlorine levels are declining and ozone is projected to return to levels observed pre-1980 later this century. 

We present observations defining (i) the frequency and depth of convective penetration of water into the stratosphere over the United States in summer using the Next-Generation Radar system; (ii) the altitude-dependent distribution of inorganic chlorine established in the same coordinate system as the radar observations; (iii) the high resolution temperature structure in the stratosphere over the United States in summer that resolves spatial and structural variability, including the impact of gravity waves; and (iv) the resulting amplification in the catalytic loss rates of ozone for the dominant halogen, hydrogen, and nitrogen catalytic cycles.