The bachelor thesis deals with the environmental impact of extinguishing agents. This topic has come to the fore in recent years and has been the subject of much debate. The aim of the work is to assess especially foaming agents and their effect on the environment. The work includes the results of the information obtained from the literature. The work describes two interventions in case of fire. The first fire concerns Sandoz, where a huge amount of hazardous substances were burned, extinguishing foams were used, which had a very negative impact on the environment. The second intervention was a fire by Detox in the Slovak Republic. The origin of the burning substances was very similar, but in this case the leakage of a dangerous substance was prevented. By comparing these two cases, it is possible to point out the measures taken against pollution. Foaming agents are particularly toxic to aquatic organisms and cause them to die. By monitoring different types of foaming agents, it has been found that synthetic foaming agents are more dangerous in their composition because they are not able to biodegrade to the same extent as protein foaming agents. The environmental safety of extinguishing agents will hopefully be improved in the future and the damage caused by extinguishing agents will be negligible over time.