Risk assessment is a process that follows the estimation of risk, respectively risk analysis. Risk evaluation is the last step in the process of risk assessment. Risk assessment is a process where each risk is assigned by a value, so called level of risk. The level of risk (R) is generally calculated from the probability of negative effect of risk (P) and the rate of consequences caused by exposure at risk (C). Generally R = P * C. In the level of risk R can also include other, so called deteriorating / mitigating factors (endangering a large number of people, a significant threat to the environment, the presence of fire safety equipment, the distance of closest fire station and many others).