The subject deals with spectrometry with emphasis on main spectroscopic parameters, such as quantum state populations, Einstein’s theory of spectral transitions, Planck’s law of absorption and emission of gases, principles of spectral character of absorption and emission, mechanisms causing the widening of lines, line shapes as information source, spectral line intensity, position and widening, radiative transfer equation and its special cases, theoretical principles of quantitative analysis, theory of spectroscopic experiment and basic principles of experimental methods in spectroscopy, microwave spectroscopy, rotational spectra and structure of molecules, vibrational spectroscopy, normal coordinates and symmetry coordinates, IR and Raman spectroscopy applications. Furthermore, it includes spectroscopic methods as analytical tools. It is above all a case of fundamentals of methods and their advantages and disadvantages when used in atmospheric research, fire protection and safety and security engineering, characterization of methods according to the spectral range - UV/VIS, infrared and microwave spectral regions, characterization of methods according to the type of detection – local and remote detection – measurement at the Earth’s surface, satellite measurement, lidar measurement, aircraft and balloon campaigns. Spectroscopic methods for lower troposheric research and upper troposheric and lower stratospheric research. It is a case of application in simulated and real atmosphere; international projects: MIPAS (Michelson Interferometer for Passive Atmospheric Sounding being placed onboard the satellite ENVISAT), ODIN satellite submillimeter atmospheric spectroscopy, NDSC (The Network for Detection of Stratospheric Change). Significant aspects of satellite measurements and generally “remote sensing” systems for safety and security research.