Twenty-five years ago to this date, Atmósfera joined the already established journals in the field of the atmospheric sciences and provided a new venue for the dissemination of results of research in that area.

We are very thankful to Dr. Graciela B. Raga and her coeditors for the preparation of this thematic issue, which initiates the celebration of Atmósfera's 25th anniversary.

In this anniversary issue of Atmósfera we include an excellent revision of the literature on chlorine in the stratosphere prepared by Thomas von Clarmann, who is a senior researcher and head of the Satellite-Borne Remote Sensing of Trace Gases group…

The year 2014 will be full of challenges for all who are devoted to atmospheric sciences. The weather events of 2013 warn us that the effects of climate change are becoming increasingly severe. In Mexico, for example, for the first…

In this issue we continue to publish review articles focused mainly in mid-latitudes and the Latin American area, as a way of celebrating the 25th anniversary of Atmósfera. In this occasion, Chilean researchers P. Monsalves Gavilán, J. Pincheira Ulbrich and…