Our study presents results of air-pollutant measurements in four types of environmental accidents using a mobile multi-gas FTIR apparatus. Fuel leakage at a gas-station caused extremely high concentrations of pollutants. During a fire at a landfill the release of CO, SO2, NO2, heptane, ethane, propane, benzene, toluene, xylene, and styrene was also high. An accident in defense industry facilities did not lead to endangerment of the environment. An emitter-air condenser in an industrial facility released dangerous concentrations of hydrogen sulfide, mercaptans, benzene, toluene, xylene, and styrene. A mobile FTIR gas analyzer is useful in diverse ecological accidents.