Announcing the 2025 NDACC Symposium

An International Symposium Celebrating 35 Years of Global Atmospheric Research Enhanced by NDACC/NDSC Observations

The international Network for the Detection of Atmospheric Composition Change (NDACC) is composed of approximately 80 active affiliated stations distributed worldwide for observing and understanding the physical and chemical state of the troposphere up into the mesosphere. Following five years of planning, instrument design, and implementation, NDACC began network operations in January 1991 as the Network for the Detection of Stratospheric Change (NDSC), primarily to focus on the long-term evolution of the ozone layer. Since then, NDACC capabilities and priorities have grown to include the detection of trends in atmospheric composition, their impacts, and their links to climate change and air quality. Network details can be found at (

The goal of the 2025 NDACC Symposium, celebrating ~35 years of atmospheric research fostered by Network observations, is to provide a forum to exchange information on the latest scientific achievements using NDACC and related observations, and to present NDACC’s measurement strategy for the future.

Plans for the symposium are underway. Additional details regarding dates and venue will be announced as they become available.