The Laser Applications to Chemical, Security, and Environmental Analysis (LACSEA) topical meeting focuses on laser-based sensing in combustion or industrial process gases, gases that may contain chemical or biological agents, and in atmospheric gases. Sensing of liquids (e.g., aerosols) and solids (e.g., particulates or explosives) are also discussed. The rapid development of laser technologies as well as data analysis tools are paving the way for novel monitoring schemes and even real-time control in various environments. Topics cover the VUV to THz spectra range, and involve exciting new developments in analytical spectroscopy, ultrafast lasers, frequency combs, and miniaturization. Creative ideas involving new laser technologies, methodologies, and/or data analysis tools will be showcased.