When we compare risk levels, we have to take into account both the probability of an accident and the possible consequences of such an event.
Risk is the product of probability and consequences.
Small accidents with a limited number of victims occur more often than large-scale disasters. The probability for a very large number of victims to occur is higher for natural than for man-made disasters. We define a disaster as a situation with an imbalance between the acute needs and the locally available resources. In these cases, special reinforcing and coordinating measures must be taken, in order to keep the quality of medical treatment as close to normal level as possible. Sweden is a vast country.