The January 2014 issue of the SPARC newsletter No. 42 is now available with articles on the following topics:

• Report on the 34th Session of the Joint Scientific Committee of the World Climate Research Programme
• The SPARC Activity "Lifetime of halogen source gases"
• IUPAC Task Group on Atmospheric Chemical Kinetic Data Evaluation
• Report on the IGAC/SPOARC Chemistry-Climate Model Initiative (CCMI) 2013 Science Workshop
• Workshop on Research Applications of High Resolution Radiosonde Data
• Report on the 7th Atmospheric Limb Conference
• Report on the Atmospheric Composition and the summer Asian Monsoon (ACAM) Workshop
• 5th SPARC General Assembly: A brief look back